Big problem how to calculate units

This is a discussion on Big problem how to calculate units within the C++ Programming forums, part of the General Programming Boards category; I am having a problem with the line that calculates the data. It keeps saying non-lvalue. I noticed there are ...

  1. #1
    Registered User
    Join Date
    Sep 2003
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    1

    Big problem how to calculate units

    I am having a problem with the line that calculates the data. It keeps saying non-lvalue. I noticed
    there are differences between, my book (borland) and my compiler (bloodshed), am I using an old method to calculate units? Any help you can offer would be greatly appreciated.


    Code:
    // Height in miles
    // going to be a program to calculate height in diff units
    
    #include<iostream>
    
    main()
    {
    
       unsigned int feet;
       unsigned int inches;
       unsigned int heightIninches;
       unsigned int heightInmiles;
       unsigned int f = 5280;
    
    
        std::cout<<"What is your height? \n  ";  //outputs the question to the screen
        std::cout<<"First give the feet, then the inches, ok? \n ";
        system ("pause");
        std::cout<<"OK First, how many feet are you tall? \n ";
           std::cin>>feet;                   //allows input to the num variable
           system ("pause");
           std::cout<<"and now the trailing number of inches you are tall \n ";
           std::cin>>inches;
    
           feet*12+inches=heightIninches;
    return heightIninches;
    
           std::cout<<"So your height in inches is "<< heightIninches << "\n";
           system ("pause");
           std::cout<<"To see you height in miles press any key  \n";
           system ("pause");
    
                  f/heightIninches = heightInmiles;
    
    return heightInmiles;
           std::cout<<"You are "<< heightInmiles << " miles tall \n";
           system ("pause");
           return 0;
    
    }
    
    //63360 = num of inches in a mile

  2. #2
    Registered User axon's Avatar
    Join Date
    Feb 2003
    Posts
    2,572
    the problem is here:
    Code:
    feet*12+inches=heightIninches
    //the variable that you want to have a value assigned 
    //to should be on the left side of the assign operator
    //you don't write:
    12 = x; //you write:
    x = 12;
    //so $$$$ch them arround:
    heightIninches = (feet*12 + inches);
    you don't need the return heigtIninches that is in the next line.
    Do the same for height in miles....

    also
    Code:
    int main()
    and istead of writing std::whatever, you could just have this:
    Code:
    #include <iostream>
    using namespace std;
    some say this clutters stuff up, but for your usage it is great!

    axon

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  3. #3
    Hardware Engineer
    Join Date
    Sep 2001
    Posts
    1,398

    For future reference....

    codebrain,
    l-value means left-value.

    A statement with an equal sign is an assignment statement. Its NOT a mathmatical equation. It makes the variable on the left equal to the value of whatever is on the right.

    These two statements are NOT the same (in programming).
    x = y ; // Make x equal to y
    y = x ; // Make y equal to x

    In BASIC, the assignment statement is also called a LET statment. (The word "LET" is optional in BASIC):

    LET x = 12 'This is BASIC... Don't try it in C++ !!!

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