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How to do this?

This is a discussion on How to do this? within the C++ Programming forums, part of the General Programming Boards category; Sorry, taking a closer look at your output, you have a special case where for A, you print an exclamation ...

  1. #31
    C++ Witch laserlight's Avatar
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    Sorry, taking a closer look at your output, you have a special case where for A, you print an exclamation mark. As such, the way that I would solve this is to write a function, say grade_modifier, that takes the grade as an int and returns the modifier as a std::string.

    This way, you can write stuff like:
    Code:
    std::cout << "You scored an A" << grade_modifier(grade) << "!\n";
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  2. #32
    Registered User ferfy's Avatar
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    Or i could just remove the exclamation mark :P hehe

  3. #33
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by ferfy
    Or i could just remove the exclamation mark
    Yeah, that would make things easier. In that case, I would write the program like this:
    Code:
    #include <iostream>
    
    int main()
    {
        std::cout << "Enter your grade %: ";
        int grade;
        std::cin >> grade;
    
        if (grade <= 60)
        {
            std::cout << "You scored an F";
        }
        else if (grade <= 70)
        {
            std::cout << "You scored a D";
        }
        else if (grade <= 80)
        {
            std::cout << "You scored a C";
        }
        else if (grade <= 90)
        {
            std::cout << "You scored a B";
        }
        else
        {
            std::cout << "You scored an A";
        }
    
        if (grade > 60)
        {
            int last_digit = grade % 10;
            if (last_digit > 0 && last_digit <= 3)
            {
                std::cout << '-';
            }
            else if (last_digit > 7 || last_digit == 0)
            {
                std::cout << '+';
            }
        }
        std::cout << std::endl;
    }
    Notice the check for grade > 60. Without that, you'll be incorrectly printing the modifier for F.
    ferfy likes this.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  4. #34
    Registered User ferfy's Avatar
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    Quote Originally Posted by laserlight View Post
    Yeah, that would make things easier. In that case, I would write the program like this:
    Code:
    #include <iostream>
    
    int main()
    {
        std::cout << "Enter your grade %: ";
        int grade;
        std::cin >> grade;
    
        if (grade <= 60)
        {
            std::cout << "You scored an F";
        }
        else if (grade <= 70)
        {
            std::cout << "You scored a D";
        }
        else if (grade <= 80)
        {
            std::cout << "You scored a C";
        }
        else if (grade <= 90)
        {
            std::cout << "You scored a B";
        }
        else
        {
            std::cout << "You scored an A";
        }
    
        if (grade > 60)
        {
            int last_digit = grade % 10;
            if (last_digit > 0 && last_digit <= 3)
            {
                std::cout << '-';
            }
            else if (last_digit > 7 || last_digit == 0)
            {
                std::cout << '+';
            }
        }
        std::cout << std::endl;
    }
    Notice the check for grade > 60. Without that, you'll be incorrectly printing the modifier for F.


    yeah that's what i was gonna do.... but i've been up all night and it's 6am so i can't be bothered to revise it again tonight :/

    but thanks again for your help

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