Command Interface : Black Box testing

This is a discussion on Command Interface : Black Box testing within the C Programming forums, part of the General Programming Boards category; Code: #include <stdio.h> #include <stdlib.h> typedef enum boolean {FALSE, TRUE}Boolean; char getCommand(command); int main(command) { getCommand(); switch(command) { case 'F': ...

  1. #1
    Registered User
    Join Date
    Feb 2003
    Posts
    7

    Command Interface : Black Box testing

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    typedef enum boolean {FALSE, TRUE}Boolean;
    char getCommand(command);
    
    int main(command)
    {
    	getCommand();
    	switch(command)
    	{
    	case 'F':
    		printf("Flagged Current Mine"); 
    		break;
    	case 'U':
    		printf("Uncovered Cell");
    		break;
    	case 'R':
    		printf("Removed a flag");
    		break;
    	case 'Q':
    		printf("Quit Game");
    		break;
    	case 'N':
    		printf("New Game");
    		break;
    	default: printf("The value you entered is not valid");
    		break;
    	}
    	
    }
    
    	
    
    char getCommand(void)
    {
    	char command;
    
    	printf("Please Enter A Minesweeper Command\n"
    		"[F]lag a Cell\n"
    		"[U]ncover a cell\n"
    		"[R]emove a flag\n"
    		"[Q]uit game\n"
    		"[N]ew game\n\n");
    	while(TRUE){
    		while((command = getchar()) == '\n');
    		command = toupper(command);
    		if (	command == 'F' || command == 'U' ||
    			    command == 'R' || command == 'Q' ||
    				command == 'N'){
    			while (getchar() !='\n');
    			return command;
    		}
    	}
    }
    This is my code, the object is to just have a small main program to test the choices for validity, but when I type in any invalid selection it just skips a line, and when I type in a valid selection, it comes up with the default switch value, any clue why?

  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Posts
    14,826
    Code:
    int main(command)
    Main does not take 'command' as a parameter. Use:
    Code:
    int main( void )
    
    or
    
    int main( int argc, char *argv[] )
    Because really, what the hell is 'command' as far as your compiler is concerned? That's exactly what it's wondering.
    Code:
    getCommand();
    You are doing nothing with the return value. Why?
    Code:
    switch( getCommand( ) )
    That would be much better.

    Additionally, why do your functions return values if you never use them? Make main return 0 when it is done, and make your other function return the value the user enters.

    Quzah.
    Hope is the first step on the road to disappointment.

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