g++ giving me BIG troubles!!!

This is a discussion on g++ giving me BIG troubles!!! within the C++ Programming forums, part of the General Programming Boards category; I wrote this program and it compiles fine with Visual Studio. Problem is my teacher wants it compiled with g++ ...

  1. #1
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    May 2004
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    Question g++ giving me BIG troubles!!!

    I wrote this program and it compiles fine with Visual Studio. Problem is my teacher wants it compiled with g++ and I cant get it to compile. It says, "Main must return 'int'" Heres the entire program. I would appreciate any help/suggestions anyone can provide.
    Code:
    // '***' Represents start of new 'sub-function' 
    
    //   <<Got rid of header files and conio>>
    #include <iomanip>
    #include <iostream>
    
    
    
    using std::cout;
    using std::cin;
    using std::setw;
    
    
    //max int of 15.
    const unsigned x = 15;
    
    
    //define matrix as x+1 by x+1.
    typedef unsigned MatrixType[x+1][x+1];
    
    
    //declare y as user defined dimension size (odd numbers only)
    unsigned   Y;
    
    MatrixType Matrix;
    
    
    //"sub-function" definitions.
    void Description();
    void Dimensions();
    void Generate();
    void Print();
    void Exit();
    
    
    //MAIN FUNCTION--include "sub-functions" in main function.
    void main()
    {
    	    	
    	Description();
    	Dimensions();
    	Generate(); 
    	Print();
    	Exit();
    	}
    
    
    
    //***Information screen using cout statements.
    void Description()
    {
    	cout<<"????????????????????????????????????????????????????????????????????????????\n";
    	cout<<"?                                                                          ?\n";
    	cout<<"?                       MAGIC SQUARE PROGRAM                               ?\n";
    	cout<<"?                                                                          ?\n";
    	cout<<"?                                                                          ?\n";
    	cout<<"?      This is a program that creates a magic square that                  ?\n";
    	cout<<"?      will be filled in by you. A magic square is an x by x matrix        ?\n";
    	cout<<"?      that is filled with numbers so that the rows, columns and           ?\n";
    	cout<<"?      diagnol lines add up to be the same number.                         ?\n";	
    	cout<<"?                                                                          ?\n";
    	cout<<"?                                                                          ?\n";
    	cout<<"????????????????????????????????????????????????????????????????????????????\n";
    	cout<<"\n";
    	cout<<"\n";
    	cout<<"\n";
    	cout<<"\n";
    }
    
    
    //***function for getting the dimensions from keyboard.
    void Dimensions()
    {
    	cout<<"Get ready to make your Magic Square!\n";   
    	cout<<"Please enter an ODD number (3 through 15).\n";
    	cout<<"After that hit Enter.\n\n\n\n";
    	cin>>  Y;
    }
    
    
    	
    
    //***function for generating magic square with user defined input.
    void Generate()
    {
    
        
    	unsigned i;
    	unsigned Dsquare;
    	unsigned Row;
    	unsigned Column;
    	
    	//arrange matrix so that Magic Square will work.
    	Row = 1;                
    	Column = (Y+1)/2;
    	Matrix[Row][Column] = 1;   
    	Dsquare = Y*Y;
    	
    	for (i=2; i<=Dsquare; i++)
    	{
    		if ((i-1)%Y==0)
    			Row++;
    		else
    		{
    			Row--;   
    			Column++;
    		
    			if (Row==0)
    				Row = Y;
    		
    			else if (Column==(Y+1))
    				Column = 1;
    		}
    		Matrix[Row][Column] = i;
    	}
    }
    
    
    //***function for printing results.
    void Print()
    {
    
    	
    	unsigned Row;
    	unsigned Column;
    	
    	//creating lined box around numbers.
    	cout<<"\n\n\n\n\n\n\n\n"<<setw((4*Y-10)/2)
    		<<""<<setw(2)
    		<<Y<<" x "
    		<<setw(2)<<Y<<" Square\n";
    	
    	cout<<"";
    	
    	//Creates top of box (margin spacing).
    	for (Column=1; Column<=Y; Column++)
    		cout<<"";
    	    cout<<"\n";
    	
    	for (Row=1; Row<=Y; Row++)
    	{
    		//Creates 'sides' of box.
    		cout<<" ";
    		
    		for (Column=1; Column<=Y; Column++)
    			cout<<setw(3)<<Matrix[Row][Column]<<" ";
    		    cout<<"\n";
    	}
    	cout<<"";
    	
        //Creates bottom of box (margin spacing).
    	for (Column=1; Column<=Y; Column++)
    		cout<<"";
     	    cout<<"\n";
    }
    
    
    //***function for exit screen.
    void Exit()
    {
    	cout<<"This is a Magic Square!!!\n";
    	cout<<"\nThank you for using this program...\n";
    	cout<<"Please press any key to exit!\n\n\n\n";
    }

  2. #2
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    make main return int by writing int main() { } or int main() { return 0; }

  3. #3
    Registered User major_small's Avatar
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    >>make main return int by writing int main() { } or int main() { return 0; }

    no, then the compiler will complain that there's two mains... and then when he takes out the other main, his program will do nothing at all.

    change this section of your code:
    Code:
    //MAIN FUNCTION--include "sub-functions" in main function.
    int main()
    {
    	    	
    	Description();
    	Dimensions();
    	Generate(); 
    	Print();
    	Return 0;
    }
    Last edited by major_small; 05-14-2004 at 10:03 AM. Reason: bad information from last poster
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  4. #4
    Registered User jlou's Avatar
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    Or maybe:
    Code:
    //MAIN FUNCTION--include "sub-functions" in main function.
    int main()
    {
    	    	
    	Description();
    	Dimensions();
    	Generate(); 
    	Print();
    	return 0;
    }


    Of course the return 0; part isn't necessary, only the change from void to int:
    Code:
    //MAIN FUNCTION--include "sub-functions" in main function.
    int main()
    {
    	    	
    	Description();
    	Dimensions();
    	Generate(); 
    	Print();
    }

  5. #5
    Registered User major_small's Avatar
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    heh heh... oops... nice catch...
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  6. #6
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    Thanks guys, worked like a charm.

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