Command line arguments

Command line arguments in C++ are a method of passing values to a program at the time of execution.

To use command line arguments, your main body should be defined such that it accepts two parameters

• An integer value, typically called argc (argument count), which denotes the number of arguments (including the command used to execute the program)
• An array of C-strings, typically called argv (argument vector), which contains the arguments

int main(int argc, char **argv)
// int main (int argc, char *argv[]) is another way to write this
{
     for (int i = 0; i < argc; i++)
          cout << argv[i] << endl;
}

This program will print out the command used to run the program (stored in the C-string argv[0]), and all command line arguments which are stored in the C-strings argv[1] to argv[argc - 1].