Loop Trouble(Simple Program)

[schoolhelp18]

Trying to figure out why this loop decides to run an extra time no matter what.Any Help would be greatly appreciated.

#include <iostream>
#include<cctype>
using namespace std;

enum triangletype{scalene,isosceles,equilateral,notriangle};


void getsides(int&side1,int&side2,int&side3);
triangletype determineShape(int side1,int side2,int side3,triangletype&shape);
void displayShape(triangletype shape);
int main()
{
int side1,side2,side3,response;
triangletype shape;

getsides(side1,side2,side3);
shape=determineShape(side1,side2,side3,shape);
displayShape(shape);

cout<<"Do You Wish to Quit(Y or N):";
cin>>response;
response=toupper(response);

do { getsides(side1,side2,side3);
shape=determineShape(side1,side2,side3,shape);
displayShape(shape);
}
while(response =='N');


return 0;
}

void getsides(int&side1,int&side2,int&side3)
{
cout<<"Enter A Side of a Triangle: ";
cin>>side1;
cout<<"Enter The Second Side of a Triangle: ";
cin>>side2;
cout<<"Enter The Third Side of a Triangle: ";
cin>>side3;
}

triangletype determineShape(int side1,int side2,int side3,triangletype&shape)
{
if(side1+side2>side3&&side2+side3>side1&&side1+side3>side2)
{
if(side1==side2&&side2==side3&&side3==side1)
return equilateral;
else if (side1==side2||side1==side3||side2==side3)
return isosceles;
else
return scalene;
}
else
return notriangle;
}

void displayShape(triangletype shape)
{
if(shape==equilateral)
cout<<"This Triangle is Equilateral."<<endl;
else if(shape==isosceles)
cout<<"This Triangle is Isosceles."<<endl;
else if(shape==scalene)
cout<<"This Triangle is Scalene."<<endl;
else
cout<<"This Is Not A Triangle."<<endl;
}

[jsmith]

do { ... } while();

always execute at least once, since the while condition is checked at the end of the loop.

[schoolhelp18]

but even when I go to compile it,it just spits garbage back at me.

[Zhuge]

Code tags, please.

Garbage? Could you be more descriptive? Do you mean you are getting errors or something?

[schoolhelp18]

it will run my program correctly then regardless of the loop it will display the void getsides cout statement then give the press any key to continue. I tried to debug and I know the error is in the loop,i cant just find out how to correct it.

[firedraco]

You never prompt if they want to quit inside the loop, so the loop will run forever if they input 'N' the first time, once if they input anything else.