Write a C program to find the factorial of a number

Description: Take a number as input and print its factorial. Factorial of n is 1 x 2 x 3 x ... x n.

Hint:

• Start with fact = 1 and multiply it by each number from 1 to n. Use unsigned long long for bigger values.

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C program to find the factorial

#include <stdio.h>

int main(void) {
    int n;
    unsigned long long fact = 1;

    printf("Enter a number: ");
    scanf("%d", &n);

    for (int i = 1; i <= n; i++) {
        fact *= i;
    }
    printf("Factorial of %d = %llu\n", n, fact);
    return 0;
}

Output:

How it works

• fact becomes 1, 2, 6, 24 and finally 120.
• Factorial of 0 is 1, and our loop gives 1 for 0, so it is correct.
• The type unsigned long long holds values up to 20! only.

Read C Recursion for the recursive way.

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