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This is a discussion on 2 questions within the C++ Programming forums, part of the General Programming Boards category; Hello, I need to do 2 things. One program is supposed to check if the entered character is a letter ...

  1. #1
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    2 questions

    Hello,

    I need to do 2 things. One program is supposed to check if the entered character is a letter or a digit. Can I use bool to do this? Or is there something better?
    I thought I could use the true/false to do this.



    And then....

    A program that determines the sum of ASCII code of each keyword given below.

    int, float, return, operator, const, virtual, if, do, while


    I don't know how to that.

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    Your answer will be bool, certainly. You can't really "use" bool to find the answer, though.

    As to #2 I don't know how to do that either, given that none of those keywords have ASCII codes. Or do you mean sum the ASCII code of each individual letter?

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    Quote Originally Posted by tabstop View Post
    Your answer will be bool, certainly. You can't really "use" bool to find the answer, though.

    As to #2 I don't know how to do that either, given that none of those keywords have ASCII codes. Or do you mean sum the ASCII code of each individual letter?


    Yeah, probably the letters.

    I was gonna use if/else and bool to get the answer if it's a letter or digit.

    Code:
    int main(void)
    {
        
      bool n;
    
    std::cout << "Input a character: ";
    
    cin >> n;
      
    
      if(n = false)
        cout << "It's a number!";
      else 
        cout << "It's a letter!";
    
        pause();
        return 0;
    }
    But the output is always " it's a letter". Sorry, I'm still kinda new to all this.

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    You cannot input a bool, nor do you want to. You want to input a character, and check whether that character is a letter, or a digit, or something else.

  5. #5
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    Quote Originally Posted by XodoX View Post
    Yeah, probably the letters.

    I was gonna use if/else and bool to get the answer if it's a letter or digit.

    Code:
    int main(void)
    {
        
      bool n;
    
    std::cout << "Input a character: ";
    
    cin >> n;
      
    
      if(n = false)
        cout << "It's a number!";
      else 
        cout << "It's a letter!";
    
        pause();
        return 0;
    }
    But the output is always " it's a letter". Sorry, I'm still kinda new to all this.
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    oops, my bad! Thanks! It's == and works now. Tells me if it's a number or letter. But I left the bool.

  7. #7
    Woof, woof! zacs7's Avatar
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    Quote Originally Posted by XodoX View Post
    oops, my bad! Thanks! It's == and works now. Tells me if it's a number or letter. But I left the bool.
    Sure. Try 0 and see what happens :-).

    You may want to just use isdigit() from <cctype>, see cctype (ctype.h) - C++ Reference

  8. #8
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    Quote Originally Posted by zacs7 View Post
    Sure. Try 0 and see what happens :-).

    You may want to just use isdigit() from <cctype>, see cctype (ctype.h) - C++ Reference
    uniary is the new binary
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