Write a program using function to find factorial of a number

#include <stdio.h>

// Function to calculate factorial
int factorial(int n) {
int fact = 1;
for(int i = 1; i <= n; i++) {
fact *= i;
}
return fact;
}

int main() {
int num;

printf("Enter a positive integer: ");
scanf("%d", &num);

if(num < 0) {
printf("Factorial is not defined for negative numbers.\n");
} else {
int result = factorial(num);
printf("Factorial of %d is %d\n", num, result);
}

return 0;
}