C and Cpp Programming in C and Cpp Command Line Arguments Tutorial

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Tutorial: C and Cpp Programming in C and Cpp Command Line Arguments Tutorial

How to accept command line arguments (AND checking file existence)

Tutorial Details:

C and Cpp Command Line Arguments

In C++ it is possible to accept command line arguments. Command-line arguments are given after the name of a program in command-line operating systems like DOS or Linux, and are passed in to the program from the operating system. To use command line arguments in your program, you must first understand the full declaration of the main function, which previously has accepted no arguments. In fact, main can actually accept two arguments: one argument is number of command line arguments, and the other argument is a full list of all of the command line arguments.

The integer, argc is the ARGument Count (hence argc). It is the number of arguments passed into the program from the command line, including the name of the program.

The array of character pointers is the listing of all the arguments. argv[0] is the name of the program, or an empty string if the name is not available. After that, every element number less than argc are command line arguments. You can use each argv element just like a string, or use argv as a two dimensional array. argv[argc] is a null pointer.

Almost any program that wants its parameters to be set when it is executed would use this. One common use is to write a function that takes the name of a file and outputs the entire text of it onto the screen.

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