Try to compile...nothing happens

This is a discussion on Try to compile...nothing happens within the C Programming forums, part of the General Programming Boards category; Code: /******************************************************************************* * Name: tripAdvanced.c * Assignment: LAB 2 * Date Written: 10/11/2007 * Course: CS133 * Purpose: Calculate more ...

  1. #1
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    Try to compile...nothing happens

    Code:
    /*******************************************************************************
    * Name: tripAdvanced.c
    * Assignment: LAB 2
    * Date Written: 10/11/2007
    * Course: CS133
    * Purpose: Calculate more usefull info for a car trip
    * Sources:
    *******************************************************************************/
    #include <stdio.h>
    #include <stdlib.h>
    
    int main()
    {
        printf("Welcome to the Trip Planner!\n"
        "So you are ready to take a trip? Let me help you plan for\n"
        "your fuels costs and required stops to fill up your tank.\n"
        "===========================================================================\n"
        "Please provide answers to the prompts below and I will\n"
        "display a summary for you when I have computed the results.\n"
        "===========================================================================\n"
        "\n");
        
        float MPG, Lcost, Hcost, miles, gallons, LTcost, HTcost;
           
        printf("Please input your car's average miles per gallon >> ");
        scanf("%f", &MPG);
        printf("Please tell me the range of fuel costs you expect to pay (per gallon)."
        "The lowest per gallon cost of fuel is >> ");
        scanf("%f", Lcost);
        printf("The highest per gallon cost of fuel is >> ");
        scanf("%f", Hcost);
        printf("Please tell me how many miles you plan to travel >> ");
        scanf("%f", miles);
        
        gallons= miles / MPG;
        LTcost= gallons * Lcost;
        HTcost= gallons * Hcost;
            
        printf("\n"
        "===============   Trip Summary   =================="
        "\n");
        
        printf("You will need to purchase %.2f gallons of fuel.\n" , gallons);
        printf("The approximate cost of fuel for your trip is between $%.2f and $%.2f.\n" , LTcost, HTcost);
        
    system("pause");
    return 0;
    }
    That is the code I'm trying to compile. The thing is, I know that my compiler (bloodshed) works fine, as I've written several programs though it. But when I try and compile it, the only thing that comes up is "Press any key to continue..."
    I don't get any errors on it either. So then, why wouldn't show IF ANYTHING, my 1st printf?

    Thanks in advanced,
    Kevin

  2. #2
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    I just ran it and got this far but ran into some errors.

    http://i20.tinypic.com/3347xiv.png

    But I know not much about C, but just wanted to say that is how far it went for me so I can't really help out, sorry.

  3. #3
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    Huh. Just the fact you could get it to run.....

    Mabye I'll uninstall and reinstall bloodshed.

    And I figured there would probably be some errors in it. I still need to add a "would you like to plan another trip (Y/N)" loop in there too.

  4. #4
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    Yeah I am using Bloodshed Dev-C++ as well. I know it sounds dumb but make sure you are saving it as a .c For awhile I kept forgetting to save as .c and would save as .cpp on accident. If you can't figure it out might just want to reinstalling. Good luck with your project.

    edit: forgot to say, all I did was copy and paste your code into a new source file and saved it as .c and compiled and run and that is all i did.
    Last edited by nubby; 10-15-2007 at 05:33 PM.

  5. #5
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    Yup, I just made sure it was a .c, and nothing. I'll go reinstall it right now...

    edit: I just uninstalled and reinstalled everything, but it didn't help.....
    Last edited by thor4life; 10-15-2007 at 06:53 PM.

  6. #6
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    Quote Originally Posted by thor4life View Post
    Code:
    /*******************************************************************************
    * Name: tripAdvanced.c
    * Assignment: LAB 2
    * Date Written: 10/11/2007
    * Course: CS133
    * Purpose: Calculate more usefull info for a car trip
    * Sources:
    *******************************************************************************/
    #include <stdio.h>
    #include <stdlib.h>
    
    int main()
    {
        printf("Welcome to the Trip Planner!\n"
        "So you are ready to take a trip? Let me help you plan for\n"
        "your fuels costs and required stops to fill up your tank.\n"
        "===========================================================================\n"
        "Please provide answers to the prompts below and I will\n"
        "display a summary for you when I have computed the results.\n"
        "===========================================================================\n"
        "\n");
        
        float MPG, Lcost, Hcost, miles, gallons, LTcost, HTcost;
           
        printf("Please input your car's average miles per gallon >> ");
        scanf("%f", &MPG);
        printf("Please tell me the range of fuel costs you expect to pay (per gallon)."
        "The lowest per gallon cost of fuel is >> ");
        scanf("%f", Lcost);
        printf("The highest per gallon cost of fuel is >> ");
        scanf("%f", Hcost);
        printf("Please tell me how many miles you plan to travel >> ");
        scanf("%f", miles);
        
        gallons= miles / MPG;
        LTcost= gallons * Lcost;
        HTcost= gallons * Hcost;
            
        printf("\n"
        "===============   Trip Summary   =================="
        "\n");
        
        printf("You will need to purchase %.2f gallons of fuel.\n" , gallons);
        printf("The approximate cost of fuel for your trip is between $%.2f and $%.2f.\n" , LTcost, HTcost);
        
    system("pause");
    return 0;
    }
    i think whats going on is that you're not assigning the variables to pointers and so bloodshed is crapping out.
    its causing a segmentation fault.
    they need their little '&' signs and they should be happy after that.

    hope that works for ya
    ~M.I.

  7. #7
    Gentoo System .......... Doorsdown's Avatar
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    That is causing the errors, worked fine for me once i made that adjustment
    Last edited by Doorsdown; 10-15-2007 at 09:59 PM.

  8. #8
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    Huh. Well, I fixed the errors (thanks btw), but it still only comes up with the "any key to continue.

    I'm gonna go write some super basic "hello world" program and see if it does the same thing....

  9. #9
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    Usually, when I see code like that, I immediately think "copy-paste example code from 199x" (first tip off is rampant use of floats).
    Make sure that whatever code you use, you understand what it does and why you're using it, not just because "it makes things work right". I.E., make sure you fully understand what printf and system do.
    Your program is probably running fine (after you correct for the pointers... and while you're at it, you may aswell change the tacky use of floats (floats are so ninteen-ninety-my-computer-only-has-8-megs-of-memory , all the cool people use doubles now for real values) and horrid imperial system while your at it ), its just that system() is probably clearing your terminal or creating a new one in which the only thing you see is the "any key" message.
    If you want to prompt for termination, use getc or, to a less portable (but easier) solution, getch

  10. #10
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    Well, I figured out what the issue was. When you start a new project in bloodshed, you have to say that it's a blank project, now a .dll or anything like that. Well....I wasn't clicking that.

    And now to hijack my own thread, onto the topic of making that "Would you like to plan another trip (Y/N)?"

    Would I use a do statement? That's the only thing I can think of doing (keep in mind I'm about 2 weeks into my C class, so I don't know anywhere near all the tools I can use). I just dont know how to word it.

    I was thinking something like assigning Y=1 and N=0. Then when the user imputs Y or N, the program reads that, and goes from there. However, I have NO IDEA how to make that work

  11. #11
    CSharpener vart's Avatar
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    Use One variable like answer
    Put the user input into it - as you already know how

    Check in the loop condition if the answer == 1 - otherwise - exit loop
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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