C++ PROGRAMING PLEASE HELP !! Write a computer program in C which will simulate

Question

C++ PROGRAMING

PLEASE HELP !!

Write a computer program in C which will simulate a calculator. Your calculator needs to support the five basic operations (addition, subtraction, multipication, division and modulus) plus primality testing (natural number is prime if it has no non-trivial divisors). Example of the output follows:

CALCULATOR MENU:

1)Addition 2)Subtraction 3)Multiplication

4)Division

5)Modulus (integers only)

6)Test if prime (integers only)

7)Exit

PLEASE CHOOSE AN OPERATION: 2

ENTER THE FIRST NUMBER: 18

ENTER THE SECOND NUMBER : 20

18-20 = -2

CALCULATOR MENU:

1)Addition

2)Subtraction

3)Multiplication

4)Division

5)Modulus (integers only)

6)Test if prime (integers only)

7) Exit

PLEASE CHOOSE AND OPERATION : 6

ENTER THE NUMBER TO BE TESTED:22

NOT PRIME: 2x11=22

CALCULATOR MENU:

1)Addition

2)Subtraction

3)Multiplication

4)Division

5)Modulus (integers only)

6) Test if prime (integers only)

7)Exit

PLEASE CHOOSE AN OPERATION: 7

GOOD BYE !

The program must be bug-free and well comented

Explanation / Answer

#include<stdio.h>
void main()
{
int add(),sub(),mult(),div(),mod(),testprime(); // declaring four functions
int o,l=1;
while(l) // This loop expression never become false
{

printf(" PLEASE CHOOSE AN OPERATION: 1)addition 2)subtraction 3)multiplication 4)division 5)modulos 6)testprime 7)exit ");
scanf("%d",&o);
switch(o)
{
case 1:
add(); // calling function
break;
case 2:
sub(); // calling function
break;
case 3:
mult(); // calling function
break;
case 4:
div();   // calling function
break;
case 5:
mod();
break;
case 6:
testprime();
break;

default:
l=0;
printf("GOOD BYE ! ");
break;// This function is used to terminate the program because in while loop exp.(1) is used

}

}

}
int add() //calling add function
{
int a,b,c;
printf("Enter two numbers");
scanf("%d%d",&a,&b);
c=a+b;
printf("%d + %d = %d",a,b,c);
getchar();
return(0); //nothing to return

}
int sub()
{
       int a,b,c;
printf("Enter two numbers");
scanf("%d%d",&a,&b);
c=a-b;
printf("%d - %d= %d",a,b,c);
getchar();
return(0);
}
int mult()
{
int a,b,c;
printf("Enter two numbers");
scanf("%d%d",&a,&b);
c=a*b;
printf("%d X %d = %d",a,b,c);
getchar();
return(0);
}
int div()
{
int a,b,c;
printf("Enter two numbers");
scanf("%d%d",&a,&b);
c=a/b;
printf("%d / %d = %d",a,b,c);
getchar();
return(0);
}
int mod()
{
    int a, b, d=0;
    printf("Please enter first number   : ");
    scanf("%d", &a);
    printf("Please enter second number : ");
    scanf("%d", &b);
    d=a%b;
    printf("Modulus of entered numbers = %d",d);
        getchar();
        return(0);
}
int testprime()
{
int n, i, flag=0;
printf("Enter a positive integer: ");
scanf("%d",&n);
for(i=2;i<=n/2;++i)
{
      if(n%i==0)
      {
          flag=1;
          break;
      }
}
if (flag==0)
      printf("%d is a prime number.",n);
else
      printf("%d is not a prime number.",n);

        getchar();
        return(0);
}

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