program arguments

This is a discussion on program arguments within the C Programming forums, part of the General Programming Boards category; Ok, I'm stuck again. I'm want my program to accept different arguments from the command line, but haven't been able ...

  1. #1
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    program arguments

    Ok, I'm stuck again.

    I'm want my program to accept different arguments from the command line, but haven't been able to get it to work. I want something like . . .

    Code:
    #include <stdio.h>
    int main( int argc, char *argv[] )  
    {
    	if( argv[1] == "-h" )
            {
    		printf("This is the help message");
            }
            return 0;
    
    }
    I also tried using a switch statement, but no luck so far. Any help would be appreciated. Thanks.

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    Use strcmp to compare strings:
    if (strcmp(argv[1], "-h") == 0)
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
    Deathray Engineer MacGyver's Avatar
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    And check argc first before you blast through argv.

  4. #4
    Registered User slingerland3g's Avatar
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  5. #5
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    Thanks.
    Here's what I finally got to work!

    Code:
    #include <stdio.h>
    
    int main(int argc, char *argv[])
    {
    	switch(argc)
    	{
    		case 2: 
    			if (strcmp(argv[1], "-h") == 0)
    			{
    				printf("This is the help message!\n");
    			}
    			break;
    	}
    	return 0; 
     }

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