C_141210_Funciones, C (gcc)

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//Title of this code

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

long factorial(short a);
short mcd(short a, short b);
short esPrimo(long p);

int main(void)
{
    short n;
    short a, b;
    long p;
    
    printf("Valor de n ... "); scanf(" %hd", &n);
    printf("\n\nEl factorial de %hd es %ld\n\n", 
           n, factorial(n));
    printf("Valor de a ... "); scanf(" %hd", &a);
    printf("Valor de b ... "); scanf(" %hd", &b);
    
    printf("\n\nEl mcd de %hd y %hd es %hd\n\n", 
          a, b, mcd(a, b));
    printf("Valor de n ... "); scanf(" %ld", &p);
    if(esPrimo(p)) printf("\n\n%ld es PRIMO\n", p);
    else printf("\n\n%ld No es PRIMO\n", p); 
    
    for(n = 0 ; n < 20 ; n++)
    {
        printf("%3hd --> %25ld\n", n, factorial(n));
    }
    
    return 0;
}

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

short mcd(short a, short b)
{
    while(b)
    {
        short aux = a;
        a = b;
        b = aux % b;
    }
    return a;
}

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

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Compilation time: 0.22 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.37 sec