A_141211_FuncionesVarias, C (gcc)

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//Title of this code

#include  <stdio.h>
#include <math.h>

long factorial(short n);
short mcd(short x, short y);
short esPrimo(short p);

int main(void)
{
    short n;
    long F;
    short a, b;
    
    
    printf("Valor de n ... "); scanf(" %hd", &n);
    F = factorial(n); 
    printf("El factorial de %hd es %ld\n", n, F);
    
    printf("Valor de a ... "); scanf(" %hd", &a);
    printf("Valor de b ... "); scanf(" %hd", &b);
    
    short m = mcd(a, b);
    printf("El mcd de %hd y %hd es %hd\n", a, b, m);
    
    short p;
    printf("Valor de p ... "); scanf(" %hd", &p);
    if(esPrimo(p)) printf("Es PRIMO\n");
    else printf("NO es PRIMO\n");

printf("\n\n\n");

short i;
    for(i = 0 ; i <= 20 ; i++)
    {N
        printf("%3hd --> %25ld\n", i, factorial(i));
    }

return 0;
}

long factorial(short n)
{
    long F = 1;
    while(n) F *= n--;
    return F;
}

short mcd(short x, short y)
{
    
    while(y)
    {
        short aux = x;
        x = y;
        y = aux % y;
    }
    return x;    
}

short esPrimo(short p)
{
    if(p == 1 || p == 2) return 1;
    short d;
    for(d = 2 ; d <= sqrt(p) && p % d ; d++);
//   if(p %  d == 0) return 0;
//    return 1;
    return p % d;
}

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Compilation time: 0.13 sec, absolute running time: 0.13 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.34 sec