using Arrow keys & random number generator

This is a discussion on using Arrow keys & random number generator within the C Programming forums, part of the General Programming Boards category; I'm a beginner at C. I'd like to know how the arrow keys can be used in C. What type ...

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    using Arrow keys & random number generator

    I'm a beginner at C. I'd like to know how the arrow keys can be used in C. What type of input does the compiler receive when one of the arrow keys is pressed ? How can we use it in a program(like up means next entry,down means previous) ?

    I'd also like to know as to how a random number(within certain limits) can be generated in C ?

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    Registered User krishnapollu's Avatar
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    when u press an arrow key, it returns two values. a null character followed by an ascii value.
    the ascii values returned are as follows:

    right- 75
    left- 77
    up- 80
    down- 72

    u can generate random numbers using the functions random(),rand(), srand()...
    eg: random(9) generates a random number b/w 0 and 9

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    but how to use it a program ? could you give an example ?

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    Quote Originally Posted by revanthb3000 View Post
    but how to use it a program ? could you give an example ?
    Sit down and put on your thinking cap.... How many things happen by random?

    Rolling dice,
    Shuffling cards,
    guessing games,
    and on and on...

    So... now you have a whole bunch of programs to write while exploring the possibilities of srand() and rand() ...

    Random() is not part of standard C, neither are the arrow keys.

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    @CommonTater : I wasn't talking about the random function. I was asking about the arrow keys usage. How do you get the compiler to receive the arrow keys input ? What code/function do you have to enter in the program ?

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    Registered User krishnapollu's Avatar
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    Quote Originally Posted by revanthb3000 View Post
    I was asking about the arrow keys usage. How do you get the compiler to receive the arrow keys input ? What code/function do you have to enter in the program ?

    I think u want to know how the arrow keys can be sensed while running a program.
    here is a simple example.

    Code:
    #include <stdio.h>
    #include <conio.h>
     
    int main(void)
    {
      unsigned char key, key2;
     
      while( (key=getch()) != '\r' )
      {
        if (key == 0)
        {
          key2 = getch();
          switch(key2)
          {
            case 72:
              printf("up "); break;
            case 75:
              printf("left "); break;
            case 77:
              printf("right "); break;
            case 80:
              printf("down "); break;
            default: break;
          }
        }
      }
      return 0;
    }

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    Except that conio is not part of standard C and is not supplied with all compilers.

    There are third party libraries for this, google is your friend.


    @krishnapollu ... which compiler are you using?

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    Thats makes life a lot easier for me..Thanks a lot guys

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