Borland C++ 5.0 input using arrow keys

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SUMMARY

This discussion focuses on detecting arrow key inputs in Borland C++ 5.0. Users must utilize the getch() function in conjunction with the kbhit() function to handle special keys, as they generate a two-character sequence starting with a zero. The specific codes for the arrow keys are 331 (left), 333 (right), 336 (down), and 328 (up), which are distinguished by adding 256 to the ASCII values. A sample program is provided to demonstrate this functionality.

PREREQUISITES
  • Understanding of Borland C++ 5.0 programming environment
  • Familiarity with the getch() and kbhit() functions
  • Knowledge of ASCII character encoding
  • Basic programming concepts such as loops and conditionals
NEXT STEPS
  • Explore the conio.h library functions in Borland C++
  • Learn about handling keyboard input in C++ using kbhit()
  • Research how to compile and run C++ programs in different operating systems
  • Investigate advanced input handling techniques for game development in C++
USEFUL FOR

Game developers, C++ programmers, and anyone interested in handling keyboard input for applications using Borland C++ 5.0.

Ephysics
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hi!
I've started making my own games in Borland C++ 5.0
I want to learn how to detect the user's input of arrow keys (for eg. when a user presses UP,DOWN ,RIGHT or LEFT)
Can somebody please post a short tutorial on detecting arrow keys?
Thank You
Ephysics

PS-
Is this correct ?
int c = getch();
if(c == 0)
{
c = getch();
c*=256;
}
 
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You can't use getch with special keys.
The lib for your compiler needs to have an OS specific function, it's also different if you are in windows or on a console. Look for something like kbhit or conio
 
mgb_phys said:
You can't use getch with special keys.
The lib for your compiler needs to have an OS specific function, it's also different if you are in windows or on a console. Look for something like kbhit or conio

I am sorry, I don't understand what you are saying.
Ephysics
 
On Windows, the special keys form a chain of two characters, beginning with a zero. It is like another page of ASCII characters with an added value of 256.
The following example program compiled with Borland C++ should make this clear.

Compile and run the following program, then you can check the codes required, for example, left/right/down/up arrows have codes 331,333,336,328 respectively with the added 256 to distinguish from the normal ASCII codes. To quit the program, press the escape key (ASCII 27 decimal, octal 33)
Code:
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
int main(int argc, char *argv[]){
    unsigned car=' ';
    do{
        if(car==0)car=getch()+256;
        printf("%ud",car);
    }while((car=getch())!='\033');
    return 0;
}
 

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