#include <stdio.h>
double fact (int n);
int main (void)
{
int m, n;
double p;
printf("Enter m,n:\n");
scanf ("%d%d", &m, &n);
p = fact(n)/fact(n-m);
printf ("result = %.0f\n", p);
return 0;
}
double fact (int n)
{
int i;
double product;
product = 0;
for (i = 1; i <= n; i++){
product = product * i;
}
return product;
}
product = 0;改为product = 1;