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

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS151 / KCS251 Programming for Problem Solving - Using C Language

Lab Exercises

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

/*

 File: Prgrm44.c

 Author: Aditya Saini

 Date: Jan 20, 2021

 Description: Program to find the factorial of given number using command line argument.

*/

#include <stdio.h>

#include <stdlib.h>

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

{

     int num, fact;

     int i;

     if (argc == 1)

          printf ("Error! No command line argument found");

     else

     {

          num = atoi (argv[1]);

          //Calculate factorial

          fact = 1;

          for (i = 1; i <= num; i++)

               fact = fact * i;

          //Print result

          printf ("Factorial of %d is %d.", num, fact);

     }

     return 0;

};

Output

C:\Users\digita>"G:\KCS151 or KCS251\Prgrm44.exe" 5

Factorial of 5 is 120