Creating a Loop (PLEASE HELP!)

[ChaosTony]

I have been having trouble with a really basic program and it's making me feel bad! I narrowed it down to 1 error but I can't figure out what is wrong...

-------------------------------------------------------------------------------------

bool end = false;

It says there is a syntax error here --> while(!end)



#include <iostream.h>

int main ()

{
char answer;
int m;
int n;
int c;//variables for Pythagorean Theorem

cout << "Please enter a number.\n";
cin >> m;//enter the larger number
cout << "Now enter a number smaller than the first.\n";
cin >> n;//enter the smaller number
if(n >= m)//Check for correct input.
cout << "You entered incorrect input.\n";
if(n >= m)//I couldn't get it to perform 2 actions.
return 0;

c = (m * m) + (n * n); //find the solution
cout << "Your answer is " << c << '\n';
cout << "Would you like to perform another problem? (y, n) ";
cin >> answer;
if(n)
end = true;
return 0;
}

[jverkoey]

Welcome to the boards. First off

Code tags are nice

#include <iostream.h>

int main ()
{
	char answer;
	int m;
	int n;
	int c;//variables for Pythagorean Theorem

	cout << "Please enter a number.\n";
	cin >> m;//enter the larger number
	cout << "Now enter a number smaller than the first.\n";
	cin >> n;//enter the smaller number
	if(n >= m)//Check for correct input.
		cout << "You entered incorrect input.\n";
	if(n >= m)//I couldn't get it to perform 2 actions.
		return 0;

	c = (m * m) + (n * n); //find the solution
	cout << "Your answer is " << c << '\n';
	cout << "Would you like to perform another problem? (y, n) ";
	cin >> answer;
	if(n)
		end = true;
	return 0;
}

umm....there's no while loop in that code...

[ChaosTony]

Ok, sorry...I jumped the gun a bit on that post and didn't read about code tags...

bool end = false;

while(!end)



#include <iostream.h>

int main ()

{
	char answer;
	int m;
	int n;
	int c;//variables for Pythagorean Theorem

	cout << "Please enter a number.\n";
	cin >> m;//enter the larger number
	cout << "Now enter a number smaller than the first.\n";
	cin >> n;//enter the smaller number
		if(n >= m)//Check for correct input.
		cout << "You entered incorrect input.\n";
		if(n >= m)//I couldn't get it to perform 2 actions.
		return 0;
		
	c = (m * m) + (n * n); //find the solution
	cout << "Your answer is " << c << '\n';
	cout << "Would you like to perform another problem? (y, n) ";
	cin >> answer;
		if(n)
		end = true;
	return 0;
}

[jverkoey]

while(!end)

you can't have while loops outside of functions. Place it inside of the main function and you'll be fine.

[axon]

the loop must be inside of main()

[toysoldier]

while(!end)

why I cann't find this statement.

[axon]

#include <iostream>
using namespace std;

int main()
{

        bool end = false;
        int i = 0;
        while(!end){
           cout << i << endl;
           i++;
           if(i==3)
             end = true;
        }

        return 0;
}

[ChaosTony]

I did that and now it says that "answer" is an undeclared identifier...

[Lithorien]

First, please use the [.code] and [./code] tags. It makes everyone's life much easier.

Secondly, I'm going to re-write your program. See if you can make heads or tails of it.

#include <iostream>

int main ()
{
	char answer;
	int m, n, c; //variables for Pythagorean Theorem

	std::cout << "Please enter a number.\n";
	std::cin >> m; //enter the larger number
	
	std::cout << "Now enter a number smaller than the first.\n";
	std::cin >> n; //enter the smaller number
	
	if(n >= m) //Check for correct input.
	{
		std::cout << "You entered incorrect input.\n";
		return(0);
	}

	c = (m * m) + (n * n); //find the solution
	
	std::cout << "Your answer is " << c << '\n';
	std::cout << "Would you like to perform another problem? (y, n) ";
	std::cin >> answer;
	
	tolower(answer); // Convert your answer to lower-case.
	
	if(answer == 'n') return(0);
	else return(0);
}

Third, I'm going to ask exactly what you're trying to achieve here.

[jverkoey]

you're using the while loop without any curly braces, meaning it only extends for one command.

To make the while loop work you need to use:

{

}

example:

while(<test something here>)
{
// Code goes here
}

[ChaosTony]

lol, it's a project for school...and I wanted to make it loop for brownie points.

[ChaosTony]

what's the std:: before cout and cin?

[Elhaz]

Hi ChaosTony,

If you're trying to calculate the hypotenuse of a right angle triangle I think you'll need a sqrt() in there somewhere.

[ChaosTony]

Hi,

lol, no hypotenuse...I just need the solution

[ChaosTony]

I'd also like to comment that you guys respond REALLY fast...