Factorial calculation without finishing the program

Question

How would I make this algorithm not to terminate the program and allow me to write other numbers to calculate the factorial? I’ve tried putting one while, or do while, but in no way works, because it goes through the for and the program soon closes..

#include <stdlib.h>
#include <stdio.h>

char resp;
int cont, num;
long fat=1;

main()
{
    printf("Digite um numero para calcular o fatorial: ");
    scanf("%d", &num);

    for(cont=num;cont>1;cont--){
        fat = fat*cont;
    }
    printf("%d! = %d", num, fat);

    printf("\nContinuar [S/N]? ");
    scanf("%c", &resp);

    return 0;
}

Answer 1

You just needed to give a space on "%c" of scanf("%c", &resp); leaving this way: scanf(" %c", &resp);, with the do while, the function was thus:

#include <stdlib.h>
#include <stdio.h>



main()
{
  char resp;
    do{
      long fat=1;
      int cont, num;
    printf("Digite um numero para calcular o fatorial: ");

    scanf("%d", &num);

    for(cont=num;cont>1;cont--){
        fat = fat*cont;
    }
    printf("%d! = %d", num, fat);

    printf("\nContinuar [S/N]? ");
    scanf(" %c", &resp);
    }while(resp != 'N');

    return 0;
}

That space is enough for the scanf() understand that it is a new input. We could also use the function fflush(stdin) to avoid this problem (recommend you read about it). A hug!