What is Wrong?

This is a discussion on What is Wrong? within the C++ Programming forums, part of the General Programming Boards category; Code: #include <iostream> #include <string> using namespace std; int plus(const int& val1,const int& val2); double plus(const double& val1,const double& val2); ...

  1. #1
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    What is Wrong?

    Code:
    #include <iostream>
    #include <string>
    using namespace std;
    
    int plus(const int& val1,const int& val2);
    double plus(const double& val1,const double& val2);
    string plus(const string& val1,const string& val2);
    
    int main()
    {
        int n = plus(3,4);    // error here
        double d = plus(3.2,4.2);
        string s = plus("he","llo");
        string s1 = "aaa";
        string s2 = "bbb";
        string s3 = plus(s1,s2);
        
        cout << "n = " << n;
             << "d = " << d;
             << "s = " << s;
             << "s1 = " << s1;
             << "s2 = " << s2;
             << "s3 = " << s3
             << endl
             << endl;
        
        system("PAUSE");
        return 0;
    }
    
    int plus(const int& val1,const int& val2)
    {
        return val1 + val2
    }
    
    double plus(const double& val1,const double& val2)
    {
        return val1 + val2
    }
    
    string plus(const string& val1,const string& val2)
    {
        return val1 + val2
    }
    It says 'use' on the line int n = plus(3,4); .I dunno why though. Is it my compiler's (Dev C++) problem once again?
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  2. #2
    Code Goddess Prelude's Avatar
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    You have semicolon issues. There are semicolons where none should be and none where semicolons should be. To be more specific:
    Code:
        cout << "n = " << n;
             << "d = " << d;
             << "s = " << s;
             << "s1 = " << s1;
             << "s2 = " << s2;
             << "s3 = " << s3
             << endl
             << endl;
    A semicolon ends a statement, since the next << continues a statement, your compiler feels that continuing an ending is rather counterintuitive.

    >return val1 + val2
    A return statement should definitely be ended since the next token is a closing brace, and compilers don't like to see those in an expression for some reason.
    My best code is written with the delete key.

  3. #3
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    Originally posted by Prelude
    You have semicolon issues. There are semicolons where none should be and none where semicolons should be. To be more specific:
    Code:
        cout << "n = " << n;
             << "d = " << d;
             << "s = " << s;
             << "s1 = " << s1;
             << "s2 = " << s2;
             << "s3 = " << s3
             << endl
             << endl;
    A semicolon ends a statement, since the next << continues a statement, your compiler feels that continuing an ending is rather counterintuitive.

    >return val1 + val2
    A return statement should definitely be ended since the next token is a closing brace, and compilers don't like to see those in an expression for some reason.
    Ahh, thx. I just saw them too. But i still can't compile it....
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  4. #4
    Code Goddess Prelude's Avatar
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    >But i still can't compile it....
    I suppose Dev-C++ doesn't like your use of the identifier plus. It conflicts with the STL function object of the same name.
    My best code is written with the delete key.

  5. #5
    Senior Member joshdick's Avatar
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    Originally posted by Cris987
    But i still can't compile it....
    You're going to have to be a lot more specific. What is your new error? On what line is it? What does you modified code now look like?

    Help us to help you.
    FAQ

    "The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs." -- Joseph Weizenbaum.

    "If you cannot grok the overall structure of a program while taking a shower, you are not ready to code it." -- Richard Pattis.

  6. #6
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    Originally posted by joshdick
    You're going to have to be a lot more specific. What is your new error? On what line is it? What does you modified code now look like?

    Help us to help you.
    It's the same error on the same line:

    int n = plus(3,4);


    the error is 'use'
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  7. #7
    Registered User
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    Originally posted by Prelude
    >But i still can't compile it....
    I suppose Dev-C++ doesn't like your use of the identifier plus. It conflicts with the STL function object of the same name.
    You're right...I got it.
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