Greatest of two numbers using Command Line

 Write a program to find the greatest of two numbers 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[])
{
    if (argc != 3)
    {
        printf("Enter two numbers ");
        return -1;
    }
    else
    {
        int firstNum = atoi(argv[1]);
        int secondNum = atoi(argv[2]);
        if (firstNum == secondNum)
            printf("Both are equal");
        else if (firstNum > secondNum)
            printf("Greatest is %d", firstNum);
        else if (secondNum > firstNum)
            printf("Greatest is %d", secondNum);
    }
    return 0;
}

To Run a Program

1. Go to the location/directory where your program is present.
2. g++ proramName.c -o out
3. ./out  4 5

Example:

Input: firstNum=4, secondNum=5
Output: Greatest is 5