Problem with building

raptorhawk · #1 16-May-2005, 14:46

Ive created a program and when I go to build it Visual Studio tells me:

Code:

------ Build started: Project: Physics Converter, Configuration: Debug Win32 ------

Physics Converter - up-to-date.


---------------------- Done ----------------------

    Build: 1 succeeded, 0 failed, 0 skipped

But when I go to find the .exe it is no where to be found. In addition the code appears to build far faster than it should. Can someone tell me whats going on.

CPP / C++ / C Code:

#include <iostream>

using namespace std;

float X;
float A;
float T;
float Vf;
float Vo;
float answer;
float temp answer;
int choice;

int main()
{
  cout << "Please select an equation that you want to use: \n";  // Gives you the option.
  cout << "(1) X = 1/2 A T^2\n"; // 1 or
  cout << "(2) Vf = Vo + AT\n"; // 2 or
  cout << "(3) Vf^2 = Vo^2 + 2 A X\n"; // 3
  
  cin >> choice;

  cout << "\nYour choice was " << choice << endl;  // Read back the choice

     if (choice == 1) // equation 1
     {
	     cout << "\nPlease enter the variables that you know.  
		 Please put a ? for the variable that you do not know.";
		 cout << "X: ";
	     cin >> X;
		 cout << "A: ";
		 cin >> A;
		 cout << "T: ";
		 cin >> T;
				
				if (X == ?)
				{
					answer = .5 * A * T * T;
				}

				else if (A == ?)
				{
					answer = (.5 * T * T)/X;
				}

				else if (T == ?)
				{
					temp answer = X / (.5 * A);
					answer = sqrt(temp answer);
				}

     cin.get();
     cout << "\nHere's the answer: ";
     cout << answer << endl;
     }
	 
	 else if (choice == 2)  // equation 2
     {
	     cout << "\nPlease enter the variables that you know.  
		 Please put a ? for the variable that you do not know.";
		 cout << "Vf: ";
		 cin >> Vf;
		 cout << "Vo: ";
		 cin >> Vo;
		 cout << "A: ";
		 cin >> A;
		 cout << "T: ";
		 cin >> T;
				
				if (Vf == ?)
				{
					answer = Vo + (A * T);
				}

				else if (Vo == ?)
				{
					answer = Vf - (A * T);
				}

				else if (A == ?)
				{
					answer = (Vf - Vo) / T;
				}

				else if (T == ?)
				{
					answer = (Vf - Vo) / A;
				}

     cin.get();
     cout << "\nHere's the answer: ";
     cout << answer << endl;
     }

	 else if (choice == 3) // equation 3
     {
	     cout << "\nPlease enter the variables that you know.  
		 Please put a ? for the variable that you do not know.";
		 cout << "Vf: ";
		 cin >> Vf;
		 cout << "Vo: ";
		 cin >> Vo;
		 cout << "A: ";
		 cin >> A;
		 cout << "X: ";
		 cin >> X;
				
				if (Vf == ?)
				{
					temp answer = (Vo * Vo) + (2 * A * X);
					answer = sqrt(temp answer);
				}

				else if (Vo == ?)
				{
					temp answer = (Vf * Vf) - (2 * A * X);
				}

				else if (A == ?)
				{
					answer = ((Vf * Vf) - (Vo * Vo)) / (2 * X);
				}

				else if (X == ?)
				{
					answer = ((Vf * Vf) - (Vo * Vo)) / (2 * A);
				}

     cin.get();
     cout << "\nHere's the answer: ";
     cout << answer << endl;
     }
     

     else  // Wrong number
     {
	 cout << "\nSorry, you entered an invalid number." << endl;
     cin.get();
	 }
	 
	 cout << "\nThank you for using Robert's Physics Converter.";

	 cin.get();
	 return 0;
}

Sokar · #2 16-May-2005, 15:13

The code you posted does not even begin to compile.

You can not have a space in a variable.

CPP / C++ / C Code:

float temp answer;

Maybe,

CPP / C++ / C Code:

float temp_answer;

You can not put this on two lines like you have.

CPP / C++ / C Code:

     if (choice == 1) // equation 1
     {
       cout << "\nPlease enter the variables that you know.  
Please put a ? for the variable that you do not know.";

Maybe,

CPP / C++ / C Code:

     if (choice == 1) // equation 1
     {
       cout << "\nPlease enter the variables that you know.  " 
<<  " Please put a ? for the variable that you do not know.";

You will need to add some single quotes

CPP / C++ / C Code:

        if (X == ?)
        {

around the '?' like so

CPP / C++ / C Code:

        if (X == '?')
        {

There are still many errors that I did not point out that you will need to fix before it will compile.

raptorhawk · #3 17-May-2005, 08:47

Ok, I fixed all of those problems but I still can't see what is causing it to not compile. Why is it not trying and giving me a page full of errors.

I also changed

CPP / C++ / C Code:

cout << "X: ";
cin >> X;
cout << "A: ";
cin >> A;
cout << "T: ";
cin >> T;

to

CPP / C++ / C Code:

cout << "X: " << X << "\n";
cout << "A: " << A << "\n";
cout << "T: " << T << "\n";

When I declare the variables should I use float or int?

Also do I need a single quote around the ? when I use it in the printed message. Also do I need a single quote around µ.

Kacyndra · #4 17-May-2005, 08:55

hi
"temp answer" i'm not sure but i dont think thats allowed. I think you might want to connect the name with a _ or somehting. To make it one word.
Why Don't you paste the compiler erros. It would just be that easier to see whats going on.

Sokar · #5 17-May-2005, 09:33

Quote:

Originally Posted by raptorhawk

Ok, I fixed all of those problems but I still can't see what is causing it to not compile. Why is it not trying and giving me a page full of errors.

I am not sure. But you did not offer the version of "Visual Studio" it might be something to do with a particular version of "Visual Studio". Have you change any options that might disable the warnings. You might try making a new project and just copy and paste your code to a new project and see if that helps.

Quote:

Originally Posted by raptorhawk

When I declare the variables should I use float or int?

If you want to have variables that have a decimal then use float. If you do not need the decimal then use int.

CPP / C++ / C Code:

int var1 = 10;// no decimal
float var2 = 22.56f;//decimal

Quote:

Originally Posted by raptorhawk

Also do I need a single quote around the ? when I use it in the printed message.

No you would need to use it as an escape sequence.
http://msdn.microsoft.com/library/en...reftable_3.asp
http://www.cppreference.com/escape_sequences.html

CPP / C++ / C Code:

cout << "Hello \?" << endl;

raptorhawk · #6 17-May-2005, 14:18

Ok, I found out why I wasnt getting any errors. Turns out I forgot to link my source file to the project

. Now that I have taken care of it I was able to fix several problems. I have just three left and I dont know how to deal with them.

These are my errors:

Code:

(5) : warning C4091: '' : ignored on left of 'int' when no variable is declared
(5) : error C2143: syntax error : missing ';' before 'constant'
(5) : fatal error C1004: unexpected end of file found

Here is the relevent piece of my code:

CPP / C++ / C Code:

#include <iostream>

using namespace std;

int '?';

and:

CPP / C++ / C Code:

if (X == '?')
{
answer = .5 * A * T * T;
}

Am I doing this properly?

Also can you tell me if I am doing the square roots properly

CPP / C++ / C Code:

else if (T == '?')
{
temp_answer = X / (.5 * A);
answer = sqrt(temp_answer);
}

Thanks again for the help.

Kacyndra · #7 17-May-2005, 14:30

ok
here you go

Code:

int '?';

you can't do that
a ? is not an integer, it's a character.
You need to first delcare a character(in this case i named it QMark), and then assign
the charecter to it (?)
you declare it the following way:

Code:

char QMark = '?';

or

Code:

char QMark;
QMark = '?';

whatever is easier for you to understand

that should probably take care of it. The rest of the errors are most likely generated becaseu of that one statment. Fix it, and let me know how it goes

WaltP · #8 17-May-2005, 19:33

Or better yet:

CPP / C++ / C Code:

#define QMARK '?'

which doesn't use any memory and can't be accidentally changed thru programming error.

Also, use QMARK everywhere in place of '?'. That way if you need to change the character you only have to do it in one place.

Dave Sinkula · #9 17-May-2005, 22:19

Quote:

Originally Posted by WaltP

Or better yet:

CPP / C++ / C Code:

#define QMARK '?'

which doesn't use any memory and can't be accidentally changed thru programming error.

Also, use QMARK everywhere in place of '?'. That way if you need to change the character you only have to do it in one place.

But wouldn't

CPP / C++ / C Code:

#define QMARK '!'

seem a little odd?

WaltP · #10 18-May-2005, 01:30

That's why I'd personally use

CPP / C++ / C Code:

#define CHR_UNKNOWN '?'

in this program...

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