comparison problem

This is a discussion on comparison problem within the C++ Programming forums, part of the General Programming Boards category; Hi, I am new to C++ so this may seem like a stupid problem, but it has me stumped. What ...

  1. #1
    Registered User
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    Feb 2006
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    comparison problem

    Hi, I am new to C++ so this may seem like a stupid problem, but it has me stumped.


    What I'm supposed to do here, is compare the value in mysign to +. Add if it is +, subtract if it is -, and display error message if it is neither.
    this is what I have so far:

    Code:
    #include <iostream>
    using namespace std;
    
    main()
    {	
    
    	int first, second, result=0; 
    	char mysign;
    
    	cout<<"Please input an integer. \n";
    	cin>> first;
    
    	cout<<"Please input an integer once again. \n";
    	cin>> second;
    
    	cout<<"Please input + or - \n";
    	cin>> mysign;
    
        if (+ == mysign) ; {
    		cout<< first+second;
    		cin>> result;
    	}
    	else if(- == mysign) ; {
    		cout<< first-second;
    		cin>> result;
    	}
    	else ;{
    		cout<< "Cannot perform an operation.\n";
    	}
    
    	cout<<"The variable stored in result is:" << result << endl;
    
    	cin.get();
    	return 0;
    }
    There are probably many things wrong here, please help me correct them. I'm lost.

  2. #2
    Moderately Rabid Decrypt's Avatar
    Join Date
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    Milwaukee, WI, USA
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    300
    mysign is a char. chars are reffered to with single quotes.

    + <---That's an operator

    '+' <-----That's a character

    When your program looks at mysign, make sure you're using the right one.
    There is a difference between tedious and difficult.

  3. #3
    pwns nooblars
    Join Date
    Oct 2005
    Location
    Portland, Or
    Posts
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    You need to put " " around the symbols. Right now you are saying "minus from itself mysign" you want it to be "-" == mysign so that it is comparing the 2.

  4. #4
    1479
    Join Date
    Aug 2003
    Posts
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    Code:
    if ('+' == mysign) ; {
    Remove the ; from that line and from
    Code:
    if ('-' == mysign) ; {
    Knowledge is power and I want it all

    -0RealityFusion0-

  5. #5
    I Write C++ Apps, Sue Me.
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    Code:
    #include <iostream>
    using namespace std;
    
    int main()
    {	
    
    	int first, second, result=0; 
    	char mysign;
    
    	cout<<"Please input an integer. \n";
    	cin>> first;
    	cin.ignore();
    
    	cout<<"Please input an integer once again. \n";
    	cin>> second;
    	cin.ignore();
    
    	cout<<"Please input + or - \n";
    	cin>> mysign;
    	cin.ignore();
    
        if (mysign=='+')  {
            result = first + second;
    	}
        if(mysign=='-')  {
            result = first - second;
    	}
    
    	cout<<"The variable stored in result is: " << result << endl;
    
    	cin.get();
    	return 0;
    }
    Here, I cleaned up the code for you.

  6. #6
    Registered User
    Join Date
    Feb 2006
    Posts
    2
    Thank you all very much.

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