Thread: reading in command line arguments

i have been watching a quick video on using argc and *argv[]. he used debug as an example for the code but didn't go any further with it other than printing out a line saying "in debug mode".

how does one actually implement it do you redefine a #define debug or have some other global variable and continually test what mode your in?

coop

To read in command arguments, the video is correct, you would use argc, the number of arguments passed to the program, and *argv[] or **argv, an array of character string arguments passed.

Here's an example:

Code:

#include <stdio.h>

int main(int argc, char** argv)
{
    // get the first argument
    // the name of the program
    char* first_arg = argv[0];
    printf("Name of file: %s\n", first_arg);

    // get the second argument
    // what you're probably looking for
    char* second_arg = argv[1];
    printf("Input: %s\n", second_arg);

    for (int i = 0; i < argc; i++) {
        printf("Argument [%d] %s\n", i, argv[i]);
    }

    return 0;
}

You can send the program as many arguments as you want. argc will increasse the argument count and **argv will put them in an array.