expression must be of integral type in function main()

This is a discussion on expression must be of integral type in function main() within the C++ Programming forums, part of the General Programming Boards category; Code: //uppgift.cpp #include <iostream> using namespace std; #include <float.h> int main () { float car, tal1, tal2, tal3; cout <<"*******************************\n"; ...

  1. #1
    Registered User
    Join Date
    Jan 2009
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    2

    expression must be of integral type in function main()

    Code:
    //uppgift.cpp
    #include <iostream>
    using namespace std;
    #include <float.h>
    
    int main ()
    {
       float car, tal1, tal2, tal3;
    
       cout <<"*******************************\n";
       cout <<"*Bensinförbruknings-kalkylator*\n";
       cout <<"*******************************\n\n";
    
       cout <<"Bekräfta med att trycka Enter\n\n";
    
       cout << "\nInmatning - Antal körda mil : ";
       cin >> tal1;
       
       cout << "\nInmatning - Antal tankade liter : ";
       cin >> tal2;
    
       cout <<"\nVal av bil\n\n";
       cout << "(1)Volvo\n";
       cout << "(2)Opel\n"; 
       cout << "(3)Saab\n";
       cout << "Välj bil genom att ange en siffra mellan 1-3 : ";
       cin >> car;
       switch (car)
       {
          case 1:
       cout << "Mil\tBil\tLiter\tFörbrukning\n";
       cout << "----\t----\t------\t------------\n";
        cout << "" << tal1 << " \tVolvo\t " << tal2 
             << "      " << (tal2/tal1) << "\n";
       cout <<"\n\n\n*******************************\n";
       cout <<"*    BilligaBilar AB 2006     *\n";
       cout <<"*   Skapat av Patrik Ljung    *\n";
       cout <<"*******************************\n\n";
             break;
          case 2:
       cout << "Mil\tBil\tLiter\tFörbrukning\n";
       cout << "----\t----\t------\t------------\n";
        cout << "" << tal1 << " \tOpel\t " << tal2 
             << "      " << (tal2/tal1) << "\n";
       cout <<"\n\n\n*******************************\n";
       cout <<"*    BilligaBilar AB 2006     *\n";
       cout <<"*   Skapat av Patrik Ljung    *\n";
       cout <<"*******************************\n\n";
             break;
          case 3:
       cout << "Mil\tBil\tLiter\tFörbrukning\n";
       cout << "----\t----\t------\t------------\n";
        cout << "" << tal1 << " \tOpel\t " << tal2 
             << "      " << (tal2/tal1) << "\n";
       cout <<"\n\n\n*******************************\n";
       cout <<"*    BilligaBilar AB 2006     *\n";
       cout <<"*   Skapat av Patrik Ljung    *\n";
       cout <<"*******************************\n\n";
       
        }
        return 0;
    }
    ok so this is my code and i cant get the switch function to work (dont mind the langauge of the text its in swedish ) but i cant figure out how to get the switch function to work

    thank

  2. #2
    3735928559
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    you can't use a float as an argument in a switch. it has to be an integral type; integral as part of the integer family of types. int, char, long, etc.

  3. #3
    Kernel hacker
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    Farncombe, Surrey, England
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    Din variabel "car" är en flyttals-variabel. Det går inte att använda flyttal i switch-satser.

    For those who do not understand Swedish:
    The variable "car" is a floating point value. It is not possible to use floating point for switch-statements.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  4. #4
    Registered User
    Join Date
    Jan 2009
    Posts
    2
    ok ty i figured it out now

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