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C Program to Hide a Console Window On Startup

How to Write a Command Line Program in C?

Last Updated : 24 Apr, 2025

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In C, we can provide arguments to a program while running it from the command line interface. These arguments are called command-line arguments. In this article, we will learn how to write a command line program in C.

How to Write a Command Line Program in C?

Command line arguments are passed to the main() function. For that purpose, the main function should have the following signature:

int main( int argc , char *argv[] ){       // Write your code  }

Here, argc is the number of arguments, and argv[] is the argument in the form of an array of strings.

Note: The argv[0] always contains the source file name.

C Program to Pass Command Line Arguments

C

// Program to demonstrate Command line arguments in C #include <stdio.h> #include <stdlib.h>  int main(int argc, char* argv[]) {     // code to calculate the sum of n numbers passed to CLA     int i, sum = 0;      // iterating the loop till the the number of     // command-line arguments passed to the program     // starting from index 1     for (i = 1; i < argc; i++) {         sum = sum + atoi(argv[i]);     }     printf("Sum of %d numbers is : %d\n", argc - 1, sum);        return 0; }

Command Line Instruction

// assume that the file name is solution  ./solution 10 20 30 40 50

Output

SUM of 5 numbers is: 150

Note: The command line arguments are separated by space so if you want to pass a space-separated string as a command line argument, then enclose them inside the "".

To know more, refer to the article - Command Line Arguments in C

C Program to Hide a Console Window On Startup

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Article Tags :

C Programs
C Language
c-input-output
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C Examples

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