#include <stdio.h>
#include <stdlib.h>
int fn_mcd(int a, int b);
int main(void)
{
int a, b, x, y;
int n, d, mcd;
printf("Fracciones a sumar (por ejemplo 5/20 2/8): ");
fflush(stdout);
if (scanf("%d/%d %d/%d", &a, &x, &b, &y) != 4 || x == 0 || y == 0)
return EXIT_FAILURE;
d = (x * y) / fn_mcd(x, y); /* Minimo comun multiplo */
n = a * (d/x) + b * (d/y);
printf("\n%d/%d + %d/%d = %d/%d", a, x, b, y, n, d);
if ((mcd = fn_mcd(n, d)) != 1)
printf(" = %d/%d", n/mcd, d/mcd);
puts("");
return EXIT_SUCCESS;
}
int fn_mcd(int a, int b)
{
int r;
while (b != 0){
r = a % b;
a = b;
b = r;
}
return a;
}
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