Convert c++ float to jfloat???
Hi,
I'm trying to get a float value from my C++ program to Java. I'm creating the float variable in eVC++ and doing some calculation with that and then want to return the float in java. But I always get the value of float variable in Java is 0.0. And I also can't check the value of 'width' in eVC++. How can I print the value of float in a messagebox in eVC++ or in Java console from C++ program? How can I get the C++ float value to Java? The C++ code -
JNIEXPORT jfloat JNICALL Java_packageName_ClassName_methodName(JNIEnv *env, jobject, jstring jStr) {
float width;
doing something with width
return width;
}Any idea???
thanx
1) Does this code compile without warnings? You have this signature:
JNIEXPORT jfloat JNICALL Java_packageName_ClassName_methodName(JNIEnv *env, jobject, jstring jStr)yet you return a float value...
2) What is the output if you run with java -Xcheck:jni [... other args ...] yourClass
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Message was edited by: Nablan Umar -
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Attachments:
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Hi,
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cheers!One of the Java's problems is that you can easily get lost in the sea of Javadocs...
java.io.DataOutputStream
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[Java2SE Float|http://download-llnw.oracle.com/javase/6/docs/api/java/lang/Float.html#valueOf%28java.lang.String%29]
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"1.00000017881393421514957253748434595763683319091796875001d"
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Its better to see the Java APIs first for any information, we will get almost all the information we need from APIs
Regards,
Venkatesh -
We have swipe system , its transactions date are storing in float format. How to convert these float number to oracle dates.
Below I have pasted the float numers, I am able to convert these float number using excel.
Float Number
=========
40814.221528
40814.221609
40814.221505
40814.223727
After converting in excel
===============
9/28/11 5:19 AM
9/28/11 5:19 AM
9/28/11 5:18 AM
9/28/11 5:22 AM
I will appreciate if some body can helpExcel (and various other Microsoft products) store dates as a float value measured in "days since january first 1900". Your swipe system uses the same format to store dates.
When you enter 40814.221528 in Excel and tell Excel to show the column as date, Excel is simply adding 40814.221528 days to january first 1900 and showing you the output of that calculation.
In theory therefore we can in Oracle do the same calculation as Excel does by doing this:
select DATE '1900-01-01' + 40814.221528 from dual;But like the previous answers show you, that gives a result that is two days "wrong".
The reason for this is most likely two things:
<li>Microsoft probably defines january first 1900 to be "day 1" and not "day 0".
<li>Microsoft looks like they have an error in leap year calculation.
Therefore we can simulate the Microsoft behaviour by offsetting by two days:
select DATE '1900-01-01' - 2 + 40814.221528 from dual;Which is the same as doing this:
select DATE '1899-12-30' + 40814.221528 from dual;Excel is doing the same thing - adding the float value to a fixed date ;-) -
Convert float to a numeric with 3 decimals
Hi,
How can I convert a float number to a numeric number with 3 decimals?
Tks,
Danielahi Daniela,
Declare it as type <b>P</b>
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Data : v_float type f,
v_dec type p decimals 3.
v_dec = v_float.
write : v_float, v_dec.
Regards,
Santosh
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