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C++ command line arguments

Passing command line arguments

Pass them after the executable name

g++ greeting.cpp -o greeting ./greeting commandLineArgument

Note: command line arguments are always passed as string ./C++_program 12 will be passed as "12" in the program.

Using command line arguments

int main(int argc, char* argv[]);
// or
int main(int argc, char** argv);

• argc: argument count, int parameter containing the number of command line arguments. Its value is always at least 1 because the name of the executable is treated as an argument.
• argv: argument verctor, array containing the value of command line arguments. Range from 0 to argc -1

#include <iostream>

int main(argc, char* argv[]) {
    for(int i = 0; i < argc; i++) {
        std::cout << argv[i];
    }
    return 0;
}