Stickygoo... I'm stuck again

just a little noob problem. I stopped learning C++ for a while but have just got back into it, so I thought I'd do a little program to check I'm ok with basic stuff.

Anyway here it is, it's just a small maths game, but when I compile it (Borland Compiler) it says the variables 'guess' and 'answer' arn't used in the function main... When I'm pretty sure they are :confused:


Well, here's the code:

Code:

---

#include <iostream>

using namespace std;

int main()
{
        int answer = 1, guess = 1, x = 1;
       
        cout << "\n\n-----------------------------------\nSelect Difficulty\n1 - Easy\n2 - Medium\n3 - Hard\n4 - Quit\n\nChoice: ";
        cin >> x;
       
                switch(x)
                {
                        case 1:
                                answer = 20;
                                while(guess ! = answer)
                                {
                                        cout << "(27 + 13) / 2 = ";
                                        cin >> guess;
                                        if(guess ! = answer)
                                                cout << "Wrong!";
                                }
                                cout << "Correct!";
                                break;
                                       
                        case 2:
                                answer = 170;
                                while(guess ! = answer)
                                {
                                        cout << "(18 + 36) * 3 + 8 = ";
                                        cin >> guess;
                                        if(guess ! = answer)
                                                cout << "Wrong!";
                                }
                                cout << "Correct!";
                                break;
                               
                        case 3:
                                answer = 360;
                                while(guess ! = answer)
                                {
                                        cout << "(84 + 23 - 7) * 3.5 + (36 / 6 + 4) = ";
                                        cin >> guess;
                                        if(guess ! = answer)
                                                cout << "Wrong!";
                                }
                                cout << "Correct!";
                                break;
                       
                        case 4:
                                cout << "End of program.";
                                break;
                               
                        default:
                                cout << "Error: That is not an option";
                }
}

---

Thanks if anyone can show me where I'm going wrong :)

i get 27 errors when i compile - the problem being the space
between the ! and the = in you conditions - delete all them so
the read "!=" as opposed to "! =" and it should be fine

You have to replace "! =" with !=.

There is a space in between those characters.

!!!

Of course!

Sorry for any time wasted, but thanks for your help...


I really should have seen that :(


Thanks again!

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

EDIT::

Another problem :confused: ... I wanted to make it so my program would loop, until the user selected option 4, so I added:

Code:

---

int main()
{
        int answer, guess = 1, x = 1, looper;
       
        looper = 1;
        while(looper = 1)
        {
                cout << "\n\n-----------------------------------\nSelect Difficulty\n1 - Easy\n2 - Medium\n3 - Hard\n4 - Quit\n\nChoice: ";
                cin >> x;

---

To the script.

And to case 4 I added

Code:

---

case 4:
                                                cout << "End of program.";
                                                looper = 2;
                                                break;

---

But I'm getting the error that looper is assigned a value that is used in function main (line 60) and there is possibly an incorrect assignment (line 8). But I'm pretty sure It's all correct...

Anyone know what's wrong?
Thanks in advance!

Code:

---

while(looper = 1)

---

Do you see anything strange about what you wrote?

I hope it's a good sign if I dont :( ...

The only thing I really see wrong with it is that there's no space between the while and (looper = 1)...But I dont think that matters too much.

EDIT!!!

Yay!!!

Thanks laserlight... it was the "=" to "=="

:D :D :D

Big thanks!

Tip: in equality checking expretions put the value (if any) on the left.
10 == var because on error typing '==' like 10 = var -> ERROR! lvalue required.... but var = 10 is a legal assigment expression

Quote:

---

Tip: in equality checking expretions put the value (if any) on the left.
10 == var because on error typing '==' like 10 = var -> ERROR! lvalue required.... but var = 10 is a legal assigment expression

---

Debatable, since if you consciously remember to make the change, you will consciously remember not to use the wrong operator. If you rely on this technique to spot mistakes, you may shoot yourself in the foot when both expressions are lvalues. Some people find (var == 10) more natural than (10 == var). Oh, and modern compilers may just warn you about it anyway.