Thread: Beginner question on a 'While'

Hey there people. Im sure its a silly mistake but i cant get my while to work.

sorry to dump a large code in your faces

tell me off if you need to

Code:

#include <iostream.h>

float FindVolume(int diameter,int length)
          {
                     float pi = 3.14159265358979323846;
                     float circumference = pi*diameter;
                     float volume = circumference*length;
                     return volume;
          }


int SquareThisNumber(int number)
          {
                     int SquaredNumber = number*number;
                     return SquaredNumber;
          }

int main()
          {

                     int diameter;
                     int length;
                     int number;
                     int choice;
                     int exit = 0;


      while(exit==0);  //Should loop because exit is specified as 0 above.
                       //exit can only be changed by user input at end of program.
            {


           std::cout << "Choose what you want to do from the list below and enter the number" << std::endl;
           std::cout << "1)Square a Number" << std::endl;
           std::cout << "2)Find the Diameter of a Cylinder" << std::endl;
           std::cin >> choice;

           if(choice==1)
                     {
                        std::cout << "Please enter a number. I would love to square it." << std::endl;
                        std::cin >> number;
                        std::cout << number << " squared is: " << SquareThisNumber(number) << std::endl;
                     }

           else if(choice==2)
                     {
                        std::cout << "Type the diameter of a cylinder" << std::endl;
                        std::cin >> diameter;
                        std::cout << "Type the length of a cylinder" << std::endl;
                        std::cin >> length;
                        std::cout << "Diameter: " << diameter << "cm" << std::endl;
                        std::cout << "Length: " << length << "cm" << std::endl;
                        std::cout << "The volume is " << FindVolume(diameter,length) << "cm3" << std::endl;
                     }

           else
                     {
                        std::cout << "WTF! enter a number from the list above! foolish...";
                     }


           std::cout << "What would you like to do?" << std::endl;
           std::cout << "0)Back to menu" << std::endl;
           std::cout << "1)Exit Program" << std::endl;
           std::cin >> exit;
             }

  return 0;
}

Thanks for taking the time to click my post

Code:

while(exit==0); // Notice the semicolon?  Infinite loop!

Don't worry, its happend to all of us!

ah ha took the ; off and it worked silly me :s

thanks for the help guys

add using namespace std;
if you include this you wont have to type std::
in front of all that junk..

also why do you have the else staements, why not just leave the two as if, and set the last one as

Code:

if(blah != 1 && blah != 2)
{
     return 0;
}



EX.

if(choice==1)
{
      std::cout << "Please enter a number. I would love to square it." << std::endl;
      std::cin >> number;
      std::cout << number << " squared is: " << SquareThisNumber(number) << std::endl;
}

if(choice==2)
{
       std::cout << "Type the diameter of a cylinder" << std::endl;
       std::cin >> diameter;
       std::cout << "Type the length of a cylinder" << std::endl;
       std::cin >> length;
       std::cout << "Diameter: " << diameter << "cm" << std::endl;
       std::cout << "Length: " << length << "cm" << std::endl;
       std::cout << "The volume is " << FindVolume (diameter,length) << "cm3" << std::endl;
}

if(choice != 1 && choice != 2)
{
       std::cout << "WTF! enter a number from the list above! foolish...";
}

Um, maybe because it is more readable and requires less typing?