Factorial of given number using command line argument

Write a program to find the factorial of a given number using command line argument

//definition of main in command-line arguments

int main(int argc, char *argv[])

{

  //some coding

} 

1. argc – It is known as argument count, it stores the count of the number of arguments.
2. argv[] – Pointer, contains location of all the values(arguments).
3. *argv[] – Array of values of all the arguments

Approach

C

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
    int n, i;
    int factorial = 1;
    n = atoi(argv[1]);
    for (i = 1; i <= n; ++i)
    {
        factorial = factorial * i;
    }
    printf("Factorial is %d", factorial);
}

To Run a Program

1. Go to the location/directory where your program is present.
2. g++ proramName.c -o out
3. ./out  5

Example:

Input:  5
Output: Factorial is 120