阶乘：factorial of n (n!) = 1 * 2 * 3 * 4....n
#include <stdio.h>
int main() {
int n, i;
unsigned long long fact = 1;
printf("Enter an integer: ");
scanf("%d", &n);
// shows error if the user enters a negative integer
if (n < 0)
printf("Error! Factorial of a negative number doesn't exist.");
else {
for (i = 1; i <= n; ++i) {
fact *= i;
}
printf("Factorial of %d = %llu", n, fact);
}
return 0;
}
结果：
Enter an integer: 25
Factorial of 25 = 7034535277573963776
Process returned 0 (0x0) execution time : 4.852 s
Press any key to continue.
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