Add an exception for divide by zero to your fraction class. Write a program to t

Question

Add an exception for divide by zero to your fraction class. Write a program to test it.

Example Output:

--------------------Configuration: <Default>--------------------

Please enter the numerator: 1

Please enter the denominator: 0

Denominator cannot be zero.

Please enter the numerator:

Note, this must be handled by DenominatorIsZeroException.java.

__________________________

Write a program that reads and writes from binary or text files.

Example Output:

--------------------Configuration: <Default>--------------------

Enter the file name: kenb

Choose binary or text file(b/t): b

Choose read or write(r/w): w

Enter a line of information to write to the file:

lasdklj

Would you like to enter another line? Y/N only

n

Continue? (y/n)y

Enter the file name: kenb

Choose binary or text file(b/t): b

Choose read or write(r/w): r

File contains:

lasdklj

Continue? (y/n)y

Enter the file name: kent

Choose binary or text file(b/t): t

Choose read or write(r/w): w

Enter a line of information to write to the file:

OOP

Would you like to enter another line? Y/N only

Y

Enter a line of information to write to the file:

Java, C++ not C.

Would you like to enter another line? Y/N only

n

Continue? (y/n)y

Enter the file name: kent

Choose binary or text file(b/t): t

Choose read or write(r/w):r

File contains:

OOP

Java, C++ not C.

Continue? (y/n)n

Process completed.

Explanation / Answer

import java.lang.ArithmeticException;
import java.util.InputMismatchException;
import java.util.Scanner;
public class DivideByZeroException
{
  
   public class Divide extends ArithmeticException
{
String message;
public Divide( String message )
       {
           this.message = message;
       }

       public String toString()
       {
           return( message );
       }
   }
  
   public static void main(String[] args)
   {
       DivideByZeroException demo = new DivideByZeroException();
       demo.go();
   }
   public void go()
   {
       Scanner s = new Scanner(System.in);

       int num, deno, ans;

       try
           {
               System.out.print("Please enter the numerator: ");
               num = s.nextInt();
               System.out.println("Please enter the denomenator: ");
               deno = s.nextInt();
               ans = quotient( num, deno );
               System.out.println( "The answer is " + ans );
           }
           catch ( InputMismatchException ime )
           {
               System.out.println("Please enter an integer");
           }
           catch ( Divide asd )
           {
               System.out.println( asd.toString() );
           }

   }
public int quotient( int num, int deno) throws Divide
{
   if ( deno == 0 )
throw new Divide("Denominator cannot be zero.");
return ( num / deno );
}

}

2)

#include <stdio.h>
#include <string.h>

int main()
{
char fname[20],type,operation,input[100],c;
FILE *fp;
printf("Enter the file name: ");
scanf(" %s",fname);
printf("Choose binary or text file(b/t): ");
scanf(" %c",&type);
if(type=='b')
{
char ch='y';
strcat(fname,".bin");
printf("Choose read or write (r/w): ");
scanf(" %c",&operation);
if(operation=='w')
{
fp=fopen(fname,"wb");
if(fp == NULL)
printf("Cannot open file!");
do{
printf("Enter a line of information to write to the file: ");
scanf(" %s",input);
fwrite(input, sizeof(input[0]), sizeof(input)/sizeof(input[0]), fp);
printf("Would you like to enter another line (y/n): ");
scanf(" %c",&ch);
}while(ch!='n');
fclose(fp);
}
else if(operation=='r')
{
fp=fopen(fname,"rb");
if (fp == NULL)
printf("Cannot open file!");
c = fgetc(fp);
while (c != EOF)
{
printf ("%c", c);
c = fgetc(fp);
}
fclose(fp);
}
}
else if (type=='t')
{
char ch='y';
strcat(fname,".txt");
printf("Choose read or write (r/w): ");
scanf(" %c",&operation);
if(operation=='w')
{
fp=fopen(fname,"w");
if(fp == NULL)
printf("Cannot open file!");
do{
printf("Enter a line of information to write to the file: ");
scanf(" %s",input);
fprintf(fp," %s", input);
printf("Would you like to enter another line (y/n): ");
scanf(" %c",&ch);
}while(ch!='n');
fclose(fp);
}
else if(operation=='r')
{
fp=fopen(fname,"r");
if (fp == NULL)
printf("Cannot open file!");
c = fgetc(fp);
while (c != EOF)
{
printf ("%c", c);
c = fgetc(fp);
}
fclose(fp);
}
}
return 0;
}

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