Help with Java programming project

Question

Hi,
I need help in writing this Java program. The purpose of this program is to read a variable-length stream of 0, 1 characters from an input text file (call it input.txt) one character at a time, and generate the corresponding B8ZS output stream consisting of the +, - , and 0 characters (with appropriate substitutions) one-character-at-a-time into a text file (called output.txt).
The program must use a class called AMIConverter with an object called AMI . Class AMIConverter must have a method called convert which converts an individual input character 0 or 1 into the appropriate character 0 or + or - of AMI.
It first copy the line to file output.txt. Then read the line one character at a time and pass only valid characters (0 or 1) to AMI.convert, which assumes only valid characters. The first 1 in each new 'Example' should be converted to a +.
This is what is read in, but this is just a test case.
0101<1000
1100a1000b00
1201g101
should now produce two lines of output for each 'Example', as shown below:
This should be the output of the output.txt file
Example 1
in :0101<1000
out:0+0-+000
Example 2
in :1100a1000b00
out:+-00+00000
Example 3
in :1201g101
out:+0-+0-
To elaborate more, only 1 and 0 are passed to "convert" method. All others are ignored. 0 become 0 and 1 become either + or - and the first "1" in each new example should be a +.
This is what I have so far. So far I am not able to get the "in" part, the characters (e.g. : 0101<1000 ) out to the output.txt file. I am only able to get the "out" part. And I also can't get it to display a + for the first "1" in each new examples.
import java.io.*;
public class AMIConverter
     public static void main (String [] args) throws IOException
          AMI ami = new AMI();
          try
               int ch = ' ';
               int lineNum = 1;
     int THE_CHAR_0 = '0';
     int THE_CHAR_1 = '1';
               BufferedReader infile = new BufferedReader(new FileReader("input.txt"));
     PrintWriter outfile = new PrintWriter("output.txt");
     outfile.write("Example " + lineNum);//prints Example 1
     outfile.println();
     outfile.write("in :");
outfile.println();
outfile.write("out:");
     while ((ch = infile.read()) != -1)
     if (ch == '\r' || ch == '\n')
          lineNum++;
          outfile.println();
          outfile.println();
          outfile.write("Example " + lineNum);
          outfile.println();
          outfile.write("in :");
          outfile.println();
          outfile.write("out:");
     else
     if (ch == THE_CHAR_0)
          int output = ami.convert(ch);
          outfile.write(output);
     else     
     if (ch == THE_CHAR_1)
          int output = ami.convert(ch);
          outfile.write(output);          
}//end while
     infile.close();
     outfile.close();
     }catch (IOException ex) {}
}//main method
}//class AMIConverter
This is my AMI class
import java.io.*;
public class AMI
     int THE_CHAR_0 = '0';
int THE_CHAR_1 = '1';
int total = '+';
int minus = '-';
int count = 0;
public int convert(int ch)
     try
          PrintWriter outfile = new PrintWriter("output.txt");
          if (ch == THE_CHAR_0)
     return ch;
     else
     if (ch == THE_CHAR_1)
     count++;
     if (count%2 == 1)
          ch = total;
          return (ch);
     else
                         ch = minus;     
                         return (ch);      
}catch (FileNotFoundException e) {}      
     return ch;
}//method convert
}//class AMI
Any help would be appreicated.
Thanks!

Answer 1

Hi,
I need help in writing this Java program. The purpose of this program is to read a variable-length stream of 0, 1 characters from an input text file (call it input.txt) one character at a time, and generate the corresponding B8ZS output stream consisting of the +, - , and 0 characters (with appropriate substitutions) one-character-at-a-time into a text file (called output.txt).
The program must use a class called AMIConverter with an object called AMI . Class AMIConverter must have a method called convert which converts an individual input character 0 or 1 into the appropriate character 0 or + or - of AMI.
It first copy the line to file output.txt. Then read the line one character at a time and pass only valid characters (0 or 1) to AMI.convert, which assumes only valid characters. The first 1 in each new 'Example' should be converted to a +.
This is what is read in, but this is just a test case.
0101<1000
1100a1000b00
1201g101
should now produce two lines of output for each 'Example', as shown below:
This should be the output of the output.txt file
Example 1
in :0101<1000
out:0+0-+000
Example 2
in :1100a1000b00
out:+-00+00000
Example 3
in :1201g101
out:+0-+0-
To elaborate more, only 1 and 0 are passed to "convert" method. All others are ignored. 0 become 0 and 1 become either + or - and the first "1" in each new example should be a +.
This is what I have so far. So far I am not able to get the "in" part, the characters (e.g. : 0101<1000 ) out to the output.txt file. I am only able to get the "out" part. And I also can't get it to display a + for the first "1" in each new examples.
import java.io.*;
public class AMIConverter
public static void main (String [] args) throws IOException
AMI ami = new AMI();
try
int ch = ' ';
int lineNum = 1;
int THE_CHAR_0 = '0';
int THE_CHAR_1 = '1';
BufferedReader infile = new BufferedReader(new FileReader("input.txt"));
PrintWriter outfile = new PrintWriter("output.txt");
outfile.write("Example " + lineNum);//prints Example 1
outfile.println();
outfile.write("in :");
outfile.println();
outfile.write("out:");
while ((ch = infile.read()) != -1)
if (ch == '\r' || ch == '\n')
lineNum++;
outfile.println();
outfile.println();
outfile.write("Example " + lineNum);
outfile.println();
outfile.write("in :");
outfile.println();
outfile.write("out:");
else
if (ch == THE_CHAR_0)
int output = ami.convert(ch);
outfile.write(output);
else
if (ch == THE_CHAR_1)
int output = ami.convert(ch);
outfile.write(output);
}//end while
infile.close();
outfile.close();
}catch (IOException ex) {}
}//main method
}//class AMIConverterThis is my AMI class
import java.io.*;
public class AMI
int THE_CHAR_0 = '0';
int THE_CHAR_1 = '1';
int total = '+';
int minus = '-';
int count = 0;
public int convert(int ch)
try
PrintWriter outfile = new PrintWriter("output.txt");
if (ch == THE_CHAR_0)
return ch;
else
if (ch == THE_CHAR_1)
count++;
if (count%2 == 1)
ch = total;
return (ch);
else
ch = minus;
return (ch);
}catch (FileNotFoundException e) {}
return ch;
}//method convert
}//class AMIAny help would be appreicated.
Thanks!