C++ Advanced

It contains some important C++ programs to make you understand the concepts easily.

Command Line Arguments - C++

When you run a C++ program from the command line like this:

./main arg1 arg2 arg3

• ./program is the name of the executable (the program itself), and it is stored in argv[0].
• arg1, arg2, and arg3 are command line arguments, and they are stored in argv[1], argv[2], and argv[3] respectively.
• argc will be set to 4 because there are four items in the argv array.

For example:

#include <iostream>

int main(int argc, char* argv[]) {
    std::cout << "Number of arguments: " << argc << std::endl;

    for (int i = 0; i < argc; ++i) {
        std::cout << "Argument " << i << ": " << argv[i] << std::endl;
    }

    return 0;
}

If you run it as ./main arg1 arg2 arg3, the output will be:

Number of arguments: 4
Argument 0: ./main
Argument 1: arg1
Argument 2: arg2
Argument 3: arg3

This mechanism allows your program to receive and process input from the command line.