help with looping.

This is a discussion on help with looping. within the C Programming forums, part of the General Programming Boards category; how do i loop this back using do/while. i must have it loop back to stating the question if the ...

  1. #1
    Registered User
    Join Date
    May 2004
    Posts
    3

    help with looping.

    how do i loop this back using do/while. i must have it loop back to stating the question if the user types "y" and have it say have a nice day if the user types "n".

    #include <stdio.h>
    int main(void )
    {

    int i, is_prime=1;
    int num ;

    printf("Enter a positive integer greater than 1:", &num);
    scanf("%d", &num);
    for(i=2; i <= num/2; i++){
    if(num%i==0){

    is_prime=0;
    break;
    }
    }

    if(is_prime==1){
    printf("%d is a prime number.\n", num);
    }
    else{
    printf("%d is not a prime number.\n", num);
    }

    printf("do you wish to continue?[y/n]");

    return 0;

    }

  2. #2
    Registered User
    Join Date
    May 2004
    Posts
    127
    This should get you started.
    Code:
    int main(void)
    {
      char again;
    
      do {
        [...]
      } while (again == 'y');
      printf("Have a nice day!\n");
    
      return 0;
    }

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