C++ Problem

This is a discussion on C++ Problem within the C++ Programming forums, part of the General Programming Boards category; I've been trying to figure this out for the past 6 hours. When you run this program, lander.exe, (you may ...

  1. #1
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    Smile C++ Problem

    I've been trying to figure this out for the past 6 hours. When you run this program, lander.exe, (you may download it at http://jprotege.com/c2) in dos with the command line "lander.exe sonic 100", the program outputs text, but does not output the O's . I believe a function is not being called properly in lander.cpp

    I believe the problem is in lander.cpp

    What can I add to my code to make the O's output onto the screen when I run the lander.exe in dos?

    My project is this:
    You have to produce a program that automatically navigates a lunar module lander down an increasingly narrow canyon in the lunar surface. Note that this means that there is no interactive keyboard input, and the lander moves entirely under program control. The progress of the lander is output in the following format, with the canyon walls represented by the "O" character and the landing pod by"V"

    Thank You

  2. #2
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    my TA stated:



    all you have to do is write your output to an array, then output the

    entire array to the screen

    it would mean instead of all those cursor to calls,

    you just write a character to the screen array

    then when you've finished all the drawing to the

    array, just give that array to writeconsoleoutput


    How do I go about doing this?

    Thanks

  3. #3
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    Welcome to the boards. If you haven't already done so then please take some time to familiarise yourself with the faq:
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    It appears that you are posting a homework assignment or other project.

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  4. #4
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    I ran this in the UNIX system at school:
    g++ lander.cpp -o lander.exe
    lander.exe
    segmentation fault (core dumped)

    I also tried:
    g++ lander.cpp -o lander.exe
    lander.exe sonic 100
    AHH!!Please remember to enter a speed of either Crawl, Slow, Medium, Fast, Sonic
    Please also remember to enter a fuel amount that is not a negative number

  5. #5
    Sweet
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    Here you go
    Code:
    %include "asm_io.inc"	
    
    segment .data
    printThis      db    "Do your own homework",0
    printThis2    db    "And post things that make sense",0
    
    segment .bss
    ;nothing
    
    segment .text
    	enter	0,0
    	pusha	
    	mov	eax,printThis
    	call	print_string
    	call	print_nl
    	mov	eax,printThis2
    	call	print_string
    	call	print_nl
    	mov	eax,0
    	popa
    	leave
    	ret
    Last edited by prog-bman; 03-03-2005 at 11:29 AM.
    Woop?

  6. #6
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    Well, first you need to make sure that arguments are present before you starting look for them. Check argc more closely before accessing argv[1]. I think you meant to do something like this:
    Code:
    	if( argc != 3 )
    	{
    		outputError();
    		return 1;
    	}
    That should fix those problems.

    edit: Also, don't include cpp files. Let the linker do its job.
    Last edited by pianorain; 03-03-2005 at 12:49 PM.
    If I did your homework for you, then you might pass your class without learning how to write a program like this. Then you might graduate and get your degree without learning how to write a program like this. You might become a professional programmer without knowing how to write a program like this. Someday you might work on a project with me without knowing how to write a program like this. Then I would have to do you serious bodily harm. - Jack Klein

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