Need help on this while statement, thanks!

This is a discussion on Need help on this while statement, thanks! within the C Programming forums, part of the General Programming Boards category; I'm wondering if something is wrong with this code. the supposed output should be: Code: Enter gallons consumed(-1 to end): ...

  1. #1
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    Wink Need help on this while statement, thanks!

    I'm wondering if something is wrong with this code.

    the supposed output should be:

    Code:
    Enter gallons consumed(-1 to end): -1
    //skips the miles prompt and ends the loop
    ...some code after loop...
    but it still asks for the miles value to be entered and then ends the loop. what's wrong with this? please help.

    here's the code:

    Code:
    while (gallon != -1)
        {
              printf("Enter gallons consumed(-1 to end): ");
              scanf("%f", &gallon);
              
              printf("Enter miles: ");
              scanf("%f", &miles);
              
              tmil += miles;
              tgal += gallon;
              
              mpg = miles/gallon;
              
              printf("Your fuel efficiency is %.2f\n\n", mpg);
              }
    Thanks,

    Jann

  2. #2
    C++ Witch laserlight's Avatar
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    Notice that after you read -1 to gallon, you don't check for it. Basically, you need to fix the logic.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
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    awts! that's it! thanks a lot laserlight!

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