Function calling before loop ends

This is a discussion on Function calling before loop ends within the C++ Programming forums, part of the General Programming Boards category; Ok I have tried a few ways to get this loop to terminate before using the ending variable in the ...

  1. #1
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    Function calling before loop ends

    Ok I have tried a few ways to get this loop to terminate before using the ending variable in the function but I cannot seem to figure it out. This is just my latest attempt. I want this program to end when the user enters 0 but it always returns a square root for 0 (which of course is 0) before terminating. Did I really forget how to do this much while on vacation?

    Code:
    #include <iostream>
    #include <cmath>
    using namespace std;
    void wierdsquareroot (double x)
    {
    	cout << "The square root is " << sqrt(x) << endl;
    }
    int main ()  // Program calculates the square root of a number
    {
    	double num;
    	do
    	{
    		if (num != 0)
    		{
    			cout << "Enter a number (a double): "; cin >> num;
    			wierdsquareroot (num);
    		}
    	}while (num != 0);
    }

  2. #2
    C++ Witch laserlight's Avatar
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    You need to read the input before you do the check for num != 0.
    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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    As soon as I posted I noticed my input was inside the if statement and that is why everything was thrown off.

  4. #4
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    What laser said

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