How to Parse Command Line Arguments in C++?

How to Parse Command Line Arguments in C++?

Last Updated : 27 Feb, 2024

In C++, command line arguments are parameters that are passed to a program when it is invoked via command line or terminal. In this article, we will learn how to parse command line arguments in C++.

Parse Command Line Arguments in C++

In C++, we can parse the command-line arguments using the argc and argv[] parameters that are passed to the main function.

argc represents the number of command line arguments passed to the program,
argv is an array of C-style strings (character arrays) containing the actual arguments.

We can use loops to iterate and parse the command line arguments stored inside the argv array.

C++ Program to Parse Command Line Arguments

// C++ Program to illustrate how to Parse Command Line
// Arguments
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    cout << "You have entered " << argc
         << " arguments:" << endl;

    // Using a while loop to iterate through arguments
    int i = 0;
    while (i < argc) {
        cout << "Argument " << i + 1 << ": " << argv[i]
             << endl;
        i++;
    }

    return 0;
}

 
// C++ Program to illustrate how to Parse Command Line
// Arguments#include <iostream>using namespace std;​int main(int argc, char* argv[]){    cout << "You have entered " << argc         << " arguments:" << endl;​    // Using a while loop to iterate through arguments    int i = 0;    while (i < argc) {        cout << "Argument " << i + 1 << ": " << argv[i]             << endl;        i++;    }​    return 0;}

Input:

./program1 this is something

Output:

You have entered 4 arguments:
Argument 1: ./program1.out
Argument 2: this
Argument 3: is
Argument 4: something

How to Parse Command Line Arguments in C++?

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