While loop in a for loop,Is it possible?
Is It possible to call a while loop a particular number of time's using a for loop.
for example :
for(.....){
while(true)
Is this technically possible?
Thanks,
Hans9777 wrote:
Based on the code you wrote , the program will enter the for loop and then the while loop . It will never exit the while loop as while(true) means loop infinite times. normally while do-while and for loop can be immplemted for the same function therefore they are rarely used together.Obviously his code only showed the loop structures themselves with no loop bodies. Supposedly there may be a 'break' in the while loop somewhere, so it is not necessarily an infinite loop.
And your remark about them rarely being used together is nonsense. Loops within loops are written for legitimate logic purposes all the time, regardless of what kind of loops they are.
Similar Messages
-
Using while loops instead of for loops in arrays?
I am new to java and doing a java tutorial on using arrays and for loops. What im trying to find out is how it is possible to use a while loop instead.
I would be very grateful if anyone can suggest a way of changing my code to use a while loop.
The code I have written is:
public class DetermineGrade
public static void main(String[]args)
final char[] mark = {'A','B' ,'C' ,'D' ,'F' };
char [] grade = new char[5];
int [] Score ={95,35,65,75};
for (int i=0; i<4; i++)
if (Score >= 90)
grade= mark[0] ;
else if (Score >=80)
grade = mark[1] ;
else if (Score >=70)
grade = mark[2] ;
else if (Score >=60)
grade = mark[3];
else grade = mark[4];
for (int i=0; i<4; i++)
System.out.println("grade = " + Score + ", " + grade);
Thankyou LBIm trying to underdstand the differences in the
different loops. I can grasp the for loop but I dont
see how a while loop works, or how it id different
from the other?
for (j = INIT; j < MAX; j++) {
// do stuff
}is the same as
j = INIT;
while (j < MAX) {
// do stuff
j++;
}Lee -
How to pass the sequence number of current loop in a for loop in FPGA vi to the host
PCI-7830R
LV 8.2
What I was trying to do is to use multiple DIO to generate pulse at different sequence. Mode one is to automatically sweep from DIO1 to DIO20; mode 2 is several DIOs generate pulse simoutaneously. So I use a case structure to make the selection, in the mean time, I set up two for loop in each case so that I can use multiple pulse generations. For example, in scanning mode, if I set 2 exposures, it sweeps from 1 to 20 then do it again.
Then I need to get the loop sequence number, i of each scenario. So I put an indicator within the first loop, and create a local variable of it and put in the second one. Running the FPGA vi alone, I can see the indicator change in each case from 0 to N-1, N being the for loop time.But in the host vi, I tried to add this indicator as an element in the read/write invoke method, in the debugging mode, I could only see it directly jump to N-1 without all the changes I saw in FPGA vi.
Is it possible to get this number passed correctly from FPGA vi to the host vi? ThanksThanks for the reply Jared.
Excuse me if it looks incorrect, but I'm new to FPGA programming, so I would have to look into the FIFO you referred to. I used local variables because for one thing I have several different cases containing for loop in each of them, and I only want one indicator for the "i". If I put the indicator out of any for loop, it's only gonna show the last number which is N-1. For the other thing, it seems like property nodes are not allowed in FPGA vi. And by doing this, I can see the i number changing from 0 to N-1 in each case, well, in FPGA vi's front panel. But while I ran the host vi with everything, the indicator in host vi's front panel only showed the last number N-1. It may be the reason you said, it happened too fast before the indicator in host vi can catch it.
What I want to realize is to group the data I collect in host vi, for example, when I choose multiple exposure in each mode, and the FPGA runs 1 through 20 then do it again, I want the data stored in two groups using the loop sequence number as the seperator in file name. So it goes like 1-1, 2-1.......20-1; then 1-2, 2-2,.....20-2. -
Java For-each loop to JavaFX for loop
Hi
I have a the following Java for-each loop :
private int w = 250;
private int h = 100;
private int targetPixel[];
private final static int a = 0xff000000;
for (int i=w*h-1;i>=0;i--)
targetPixel=a;
My problem is since in JavaFX their is no for each loop how do you convert this java for-each loop to a JavaFX loop? Could you please provide me a solution with a sample code.
Thank you.How to resolve this code to java fx?
int particles = 10;
int textures = 32;
Random rnd =new Random();
IDX particle=new IDX [particles];
for(int i=0;i<particles;i++)
particle=new IDX (textures*i/particles,rnd);
Here new IDX is a class like the following class IDX
double x;
double y;
double z;
int xx;
int yy;
int index; //Texture index
public IDX (int textureID,Random rnd)
x=rnd.nextDouble()*2-1;
y=rnd.nextDouble()*2-1;
z=rnd.nextDouble()*2-1;
index=textureID;
my problem is how do you pass values to a java fx class constructor if javafx class has constructors. please help?
Edited by: R34GTR on May 14, 2009 8:29 AM -
Is it possible to execute all the iterations of the inside for loop for each iteration of the outside for loop? I have attached a screenshot of my program if it helps. If it is possible could you tell me how to do it plz?
Solved!
Go to Solution.
Attachments:
Capture.PNG 53 KBOne thought I have is that I think you want those feedback nodes reinitializing for each iteration of the outter loop. Personally, I would change them to be shift registers (it would clean up your diagram a little bit).
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
A 'For' loop within another 'For' loop
This is the loop:
for (int i = 1; i<=5; i++) {
for (int k = 1; k<=3; k++) {
System.out.println("i is " + i + ", k is " + k);
How does it execute? After it goes through the loop i = 1, and k = 1, apparently it then doesn't go to i = 2, but instead it increments k to 2, and i remains as 1 until k is greater than 3. I'm confused how this works. Does the first loop execute first, and then the second loop executes, but then the program exits out of the second loop only when k is greater than 3?
Much appreciate your help.
YashTry to imagine expanding the loops. In the example you provided, the loops aren't that big, so it's pretty easy.
for (int i = 1; i<=5; i++) {
for (int k = 1; k<=3; k++) {
System.out.println("i is " + i + ", k is " + k);
}becomes
int i = 1;
for (int k = 1; k<=3; k++) {
System.out.println("i is " + i + ", k is " + k);
i = 2;
for (int k = 1; k <= 3; k++) {
System.out.println("i is " + i + ", k is " + k);
i = 3;
for (int k = 1; k <= 3; k++) {
System.out.println("i is " + i + ", k is " + k);
i = 4;
for (int k = 1; k <= 3; k++) {
System.out.println("i is " + i + ", k is " + k);
i = 5;
for (int k = 1; k <= 3; k++) {
System.out.println("i is " + i + ", k is " + k);
}which becomes
int i = 1;
int k = 1;
System.out.println("i is " + i + ", k is " + k);
k = 2;
System.out.println("i is " + i + ", k is " + k);
k = 3;
System.out.println("i is " + i + ", k is " + k);
i = 2;
k = 1;
System.out.println("i is " + i + ", k is " + k);
k = 2;
System.out.println("i is " + i + ", k is " + k);
k = 3;
System.out.println("i is " + i + ", k is " + k);
i = 3;
k = 1;
System.out.println("i is " + i + ", k is " + k);
k = 2;
System.out.println("i is " + i + ", k is " + k);
k = 3;
System.out.println("i is " + i + ", k is " + k);
i = 4;
k = 1;
System.out.println("i is " + i + ", k is " + k);
k = 2;
System.out.println("i is " + i + ", k is " + k);
k = 3;
System.out.println("i is " + i + ", k is " + k);
i = 5;
k = 1;
System.out.println("i is " + i + ", k is " + k);
k = 2;
System.out.println("i is " + i + ", k is " + k);
k = 3;
System.out.println("i is " + i + ", k is " + k); -
While loop and for loop condition terminal
Hello friends,
I am using labview 8.6. The condition terminal of the while loop and conditional for loop is behaving in just the opposite way.
When i wire a true to the condition terminal of my loop, the while loop continues to run when I click on run. when I wire a FALSE, it stops.
Is there any setting change that I have to make it to get it work properly.
Please suggest on this.
Thanks and regards,
HerokPlease do NOT attach .bmp images with the extension changed to .jpg to circumvent the forum filters!
Herok wrote:
I am sending you the VI. I am not sure if this would help you because only in 2 computers this behaviour is seen. In others, it works as it is supposed to work.
Whatever you are seeing must be due to some corruption or folding error. It all works fine here.
To make sure there are no hidden objects, simply press the cleanup button which would reveal any extra stuff (which is obviously not there). Does it fix itself if you click the termination terminal an even number of times? What if you remove the bad loop and create a new one?
Could it be you have some problems with the graphics card and the icon of the conditional terminal does not update correctly?
Whay happens if you connect a control instead of a diagram constant?
What is different on the computers where it acts incorrectly (different CPU (brand, model), #of cores, etc.)
LabVIEW Champion . Do more with less code and in less time . -
Geting ORA 936 -while building dynamic query in for loop.
HI,
I hav written a SP and its compiled and giving me the results for the data I am quering but giving ORA936 - missing expressin and giving ORA 6512 at 2 lines. Please help me me out where I am going wrong.
CREATE OR REPLACE TYPE LIST as VARRAY(5000) of NUMBER;
CREATE OR REPLACE PROCEDURE test( V_id IN LIST,
v-fdate IN DATE,
v-tdate IN DATE,
v_flg IN CHAR)
AS
TYPE opfld IS RECORD (
FID TAB.ID%TYPE,
FCURR TAB.CURR %TYPE,
FCNT TAB.CNT%TYPE,
FTOT TAB.TOT%TYPE );
TYPE OPLIST IS REF CURSOR;
Rc oplist;
Edtab opfld;
Selstr VACHAR2(200);
Whstr1 VACHAR2(200);
Whstr2 VACHAR2(200);
Whstr3 VACHAR2(200);
Whstr VACHAR2(200);
Grpstr VACHAR2(200);
Andstr VACHAR2(200);
Fullstr VACHAR2(200);
BEGIN
Selstr := ‘SELECT col1,col2,sum(col3),sum(col4) from tab1 ’;
Whstr1 := ‘ WHERE tdate BETWEEN TO_DATE(‘||’’’’||vfdate||’’’’||’)’;
Whstr2: = ‘ AND TO_DATE(‘||’’’’||vtdate||’’’’||’)’;
Whstr := whstr1||whstr2;
Grpstr := ‘GROUP BY col1,col2’;
IF v_flg IS NOT NULL THEN
Whstr3 := whstr||’AND FLAG = ‘||v_flg;
else
Whstr3 := whstr ;
END IF;
FOR I IN 1..id.COUNT LOOP
BEGIN
Andstr := ‘ AND id =’|| v_id(i);
Whstr := whstr3 || andstr ;
Fullstr := selstr||whstr||grpstr;
OPEN rc for fullstr;
LOOP
FETCH rc into edtab
EXIT when rc%NOTFOUND;
END LOOP;
Andstr := ‘’;
Whstr :=’’;
END; ---BEGIN of FOR loop
END LOOP; -- for end
CLOSE rc;
END; -- proc end
Created above SP and its compiled. When I try to execute the SP with below code I am getting--
DECLARE
V_t LIST;
BEGIN
V_t:= LIST();
V_t.EXTEND(10);
V_t(1) := 10;
V_t(2) := 20;
Test(v_t,’25-APR-2012’,’30-APR-2012’,’Y’);
END;
The SP is building correct dynamic querry and its getting executed for id = 10 and 20, giving the correct results but though I defined only 2 ids while executing and written FOR lOOP upto ID.COUNT its building query for third time and that time its not getting id, so for the third time the last part of where clause is built like
SELECT.....
WHERE....
AND id = (its taking blank here)
GROUP BY ...;
and thus its giving me ORA 936 missing expression and ORA 06152 at line of RECORD TYPE declaration and line of OPEN rc for fullstr;
ERROR at line 1
ORA 00936 misssing expresiion
ORA 006152 at line 9
ORA 006512 at line 87
I hav put DBMS_OUTPUT statements @ every build of dynamic wuery and its correct. here I have not copid the code I hav typed hereso not wriiten DBMS_OUTPUT.
I tried lot of ways redefining Andstr := ‘’;
Whstr :=’’; after for endloop but its giving the same error. is this because I am using varray? If am providing 2 ids in anonymous block then how its building query for third blank ID value.
Please help me out here..
Thanks a lot..>
I hav written a SP and its compiled and giving me the results for the data I am quering
>
Then you should have posted the one that compiles and gives you results.
The code you posted will not compile without errors. Edit your original post and provide the corrected code.
When you do please add \ tags on the line before and after the code to preserve formatting. See the FAQ for details. -
Having trouble with inner for loop values in my procedure
Hi ...
I am using oracle 10g and here is my procedure ...
create or replace procedure sales_information is
v_qty number(10);
rem_qty number(10):=0;
cursor pck_quantity is
select * from sales_info;
cursor no_of_labels is
select ceil(sum(nvl(total_quantity,actual_quantity))/400) from sales_info;
begin
for j in no_of_labels
loop
for i in pck_quantity
loop
select nvl(i.total_quantity,i.actual_quantity) into v_qty from sales_info;
if v_qty>=i.packed_quantity and rem_qty=0 then
insert into sales_order values------------
rem-qty:=v_qty-i.packed_quantity;
v_qty:=rem_qty;
exit;
else if v_qty>=i.packed_quantity and rem_qty>=400 then
insert into sales_order values-----------
rem_qty:=v_qty-rem_qty;
v_qty:=rem_qty;
exit;
else if v_qty>=i.packed_quantity and rem_qty>0 then
rem_qty:=v_qty+rem_qty-i.packed_quantity;
v_qty:=rem_qty;
insert into sales_order values-----------
else if v_qty is null and rem_qty>0 and then
insert into sales_order values-----------
else if v_qty<i.packed_quantity and rem_qty:=0 then
rem_qty:=v_qty;
else if v_qty<i.packed_quantity and rem_qty>0 then
if (v_qty+rem_qty)>400 then
insert into sales_order values-----------
rem_qty:=v_qty+rem_qty-i.packed_quantity;
v_qty:=rem_qty;
end if;
end if;
end loop;
end loop;
The inner for loop will retrieve the same values of v_qty for every iteration of outer for loop when it runs the following select statement:
select nvl(i.total_quantity,i.actual_quantity) into v_qty from sales_info;
and thus loses the previously computed values of v_qty and rem_qty
in the previous iteration of outer for loop whereas i want the inner for loop to iterate over it's previously computed values of v_qty and rem_qty but cant think of a workaround.h4. Thanks Dave for explanation. Hope I understood your requirement and below code resolves that
-- Creating table SALES_INFO
CREATE TABLE SALES_INFO
( S_NO NUMBER(1),
ACTUAL_QUANTITY NUMBER(10),
TOTAL_QUANTITY NUMBER(10),
PACKED_QUANTITY NUMBER(10)
-- Creating table sales_order
CREATE TABLE SALES_ORDER
( S_NO NUMBER(1),
LABEL VARCHAR2(30),
ORDER_QUANTITY NUMBER(10)
-- Push SALES_INFO data
INSERT INTO SALES_INFO VALUES(1,1000,800,400);
INSERT INTO SALES_INFO VALUES(2,800,600,400);
INSERT INTO SALES_INFO VALUES(3,800,NULL,400);
INSERT INTO SALES_INFO VALUES(4,NULL,600,400);
CREATE OR REPLACE PROCEDURE populate_sales_order AS
CURSOR get_sales_info IS
SELECT s_no,
NVL(total_quantity,actual_quantity) total_quantity,
packed_quantity
FROM sales_info;
v_s_no PLS_INTEGER := 0;
v_rem_qty PLS_INTEGER := 0;
v_label_num PLS_INTEGER := 1;
BEGIN
FOR rec IN get_sales_info LOOP
v_rem_qty := rec.total_quantity + v_rem_qty;
v_s_no := rec.s_no;
WHILE v_rem_qty >= rec.packed_quantity LOOP
INSERT INTO sales_order( s_no, label, order_quantity)
VALUES ( v_s_no, 'LABEL' || v_label_num, rec.packed_quantity );
-- Reduce the packed qty from total qty and increment label counter
v_rem_qty := v_rem_qty - rec.packed_quantity ;
v_label_num := v_label_num + 1;
END LOOP;
END LOOP;
-- Put the last lot remaining qty into last carton
IF v_rem_qty > 0 THEN
INSERT INTO sales_order( s_no, label, order_quantity)
VALUES (v_s_no, 'LABEL' || v_label_num, v_rem_qty );
END IF;
COMMIT;
END;
S_NO LABEL ORDER_QUANTITY
1 LABEL1 400
1 LABEL2 400
2 LABEL3 400
3 LABEL4 400
3 LABEL5 400
4 LABEL6 400
4 LABEL7 400
{code} -
Attached please find my test vi(i use while loop instead of for loop,cause my labview version is 8.2, which don't have interrupt condition item in for loop. )
i wanted to stop the vi while the vi was running, such as i pressed the stop button when i was 4, the vi wouldn't stop immediately，it first finished the current cycle, gave me the 5th random number and time delay, then it ran the next cycle and gave me the 6th random number and stop, so i had to wait some time(time delay+the 6 cycle duration)since i pressed the button, now i hope someone can give me some advice that don't let the next cycle happen and stop the vi immediately.
Solved!
Go to Solution.
Attachments:
test.vi 13 KB413332985 wrote:
to altenbach:
thanks for your help, it's very helpful. But i still have a small problem, your example vi don't creat the first random number immediately, it waits 500 million seconds. If i change the number "500" to a much bigger number, i have to wait a longer time to get the first number, so how can i get the first number immediately while others wait?
No, that's not correct. The initial timeout is 0, so it generates the first random number immediately. Try it once more.
Here's a modification that shows it more clearly. Once the program is started, you need to press another button to start with the random numbers. As you see, the first one appears immediately.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
testtimeout2.vi 16 KB -
while i was studying about cursor for loop i found this statement in the web
"A cursor FOR loop implicitly declares its loop index as a %ROWTYPE record"
for example an emp table contain following columns empno,ename,sal,hiredate,deptno
and let us consider an cursor for loop as
for rec in select empno,sal from emp loop
if cursor for loop declare loop index as a %rowtype our cursor statement should include all the columns and follow the data type compatabulity.
But here our cursor statement includes only few columns,if we use %rowtype we have to select all columns but here we are not doing this.
Can anyone please explain what is happening in cursor for loop?for loop cursor is also like the simple explicite cursor..
the cursor variable will hold only the columns that are given in select statement of the cursor..
if u declare a cursor as %rowtype, then it should include all the columns of that particular table..
otherwise u should use only %type for each and every column seperately only... -
Config data refnums invalidated by for loop
I have found the following problem with LabVIEW 7.0. This only occurs when running the application as built with the application builder and does not appear to be a problem in the development environment.
Given an open refnum for a config file one can loop through several read key operations while passing the data and the refnum to outputs on the for loop. If you disable indexing on the refnum output of the for loop you should get a usable refnum out. What happens instead when you try to close the refnum is an error indicating that the refnum is invalid. If you simply route the refnum around the loop avoiding the for loop output altogether this doesn't happen. It appears that somehow, going through the indexing output of the f
or loop invalidates or changes the refnum when in a built application using the runtime.
If anyone can reproduce this or prove me wrong it would be helpful. This bug cost me days of chasing down why my "major app" would only work when in development but fail when built. The lack of debug capability in a built app of course leant to the effort that it took to track this down.
Thanks,Hello, i'm french so scuse for my writting...
I don't find where put this question so i writte here.
I want to do a soft who's objective is to writte config data (open config data + write key + close..).
you can find it in the join piece.
this soft run correctly but when i do an exe with the application builder, when i try to run the exe, that saying me error 7 about the Nex file in Open config data...
How can i solve this problem???
Tanks for all....
Attachments:
chconfexe.vi 32 KB -
Hello,
Do you know how I can stop a for loop ? because when I click on the stop switch on my front panel, the VI don't stop and continue to run the loop.
Peter.
Labview 2010
Solved!
Go to Solution.Peter,
It sounds like you need a while loop, not a for loop. A button or switch does not traditionally control iterations of execution for a for loop.
Please post your code so we may help better.
-Chazzmd -
Reading a csv file within a for loop
Hi guys,
Im trying to read a csv file within a for loop and the while loop only seems to be getting executed once rather than the number of times that is specified.
for(int i=0; i<paramValues.length;i++)
String StudentNo = paramValues4;
out.println("StudentNo="+StudentNo);
BufferedReader in = new BufferedReader( new InputStreamReader( conn2.getInputStream()));
String readLine; // stores a line from the file as a string//used to get rid of the first line which has course name
readLine = in.readLine();
int NumberOfElementsInArray=16;
String[] data;
data = new String[NumberOfElementsInArray];
data[0]=> StudentNo
data[1]=> Surname
data[2]=> Firstname
data[3]=> ExamNo
data[4]=> YrOfStdy
data[5]=> ProgOfStdy
data[6]=> Fld1
data[7]=> Fld2
data[8]=> DegType
data[9]=> EnrolStatus
data[10]=> StaffAdvNo
data[11]=> Tutor
data[12]=> Fld3
data[13]=> Fld4
data[14]=> Fld5
data[15]=> Pegged
data[16]
//out.println("<table border=\"1\">");
int datanumber=0;
while( (readLine = in.readLine()) != null )
out.println("ive entered the loop");
StringTokenizer tokens = new StringTokenizer( readLine, ",", true);
boolean prevTokenComma = true;
boolean emptyValue = false;
String aValue = null;
datanumber=0;
while( tokens.hasMoreTokens() )
aValue = null;
String token = tokens.nextToken();
token=token.trim();
//if the token does not equal to a comma
if( !token.equals(",") )
aValue = token;
prevTokenComma = false;
emptyValue = false;
else if( token.equals(",") && prevTokenComma )
prevTokenComma = true;
emptyValue = true;
else //( token.equals(",") && !prevTokenComma )
prevTokenComma = true;
emptyValue = false;
if(emptyValue)
aValue = "";
// Printing values
if( aValue == null)
//do nothing
else if (aValue.equals("") )
aValue=" ";
data[datanumber]=aValue;
//out.println("datanumber="+datanumber);
//out.println("<td> aValue: "+aValue+"</td>");
datanumber++;
else
data[datanumber]=aValue;
//out.println("<td> aValue: "+aValue+"</td>");
//out.println(datanumber);
datanumber++;
out.println("data[0]="+data[0]);
//out.println("data[3]="+data[3]);
//out.println("ExamNo="+ExamNo);
}//end while
in.close();
}//end for loop
When I print the variable student no at the beginning of the for loop it prints the different studentno's so the for loop is fine, but the while loop gets executed once. Does anyone know why????????/
Thanks
TzafPROBLEM SOLVED....
Basically the following declarations have been done within the for loop....
URL url2 = new URL ("http://localhost:8080/FYP/CSVFILES"+Year+"/"+WebCourse2+".csv");
URLConnection conn2 = url2.openConnection();
HttpURLConnection uc = (HttpURLConnection)conn2;
uc.connect();
try
responseCode = uc.getResponseCode();
out.println("Response code1: " + responseCode+"\n");
catch(IOException e)
responseCode = uc.getResponseCode();
//out.println("Response code2: " + responseCode+"\n");
thanks
anyway
tzaf -
For loop to iterate through temp table in store procedure in pl/sql
Hi,
how to create For loop to iterate through the temporary table in the store procedure?Neha RK wrote:
hi,
its not working , i need to check each record of table and do some task using if else loop inside that for..
if not possible to loop each row of table using for then how to use while loop.
please helpWhat's not working? We haven't got psychic powers so we can't see the code you say isn't working.
Please provide more information like create table statements, insert statements with test data, the code you've tried
and the output you are expecting from the input data.
Read {message:id=9360002} and follow the advice there.
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