Factorial of a given numbers in unix using c?

Answer 1

To calculate the factorial of a given number in C on a Unix system, you can use a simple recursive or iterative function. Here's an example of an iterative approach:

#include <stdio.h>

unsigned long long factorial(int n) {
    unsigned long long result = 1;
    for (int i = 1; i <= n; i++) {
        result *= i;
    }
    return result;
}

int main() {
    int number;
    printf("Enter a positive integer: ");
    scanf("%d", &number);
    printf("Factorial of %d is %llu\n", number, factorial(number));
    return 0;
}

Compile the code using gcc filename.c -o factorial and run it with ./factorial to calculate the factorial of a number.