Ndtyjky

this is my code

#include <conio.h>

#include <iostream>



using namespace std;



int main() {

    bool a = false;

    char b='p';

    int c=0;



    while (a != true) {

        if (_kbhit()) {

            b = _getch();

        }

        if (b=='w') {

            c++;

            cout << c << " ";

       }

        else if (b == 'c') {

            cout << "hello";

        }

    }

    system("pause");

    return 0;

}

The problem is where when I press 'w' I want it to print out the value of c and it should be repeating until i press another input for _kbhit() right? because now it add 1 to c then prints c and when i press w again samething. What's wrong with my visual studio I'm using community 2017 I've tried to uninstall it and install it again but same problem occurs.

It seems like the program behaves the way you want it to. If I press 'w', it goes into an infinite loop of increasing the value of c and printing it. Pressing any other key stops printing and pressing 'c' goes on the same infinite loop and prints hello. Doesn't seem to be any problems as far as the posted code is concerned. Also, I would like to say the same as @Someprogrammerdude, if it compiles, but doesn't behave the way you want it to, it's an issue with the code, not the IDE and/or compiler.

Hypothetical answer: Your computer might always be thinking that a key is pressed, thus kbhit() always returns true. This maybe caused by a bad mouse/keyboard/controller driver and/or configuration. The code is fine, your PC is not.

The problem you're running into seems to be a result of a recently added bug in _getch()/_kbhit.

For an extended key (e.g., a cursor key) it's documented that _getch() returns either a 0x0 or 0xe0 followed by the scan code for the key that was actually pressed. What's not documented is that if the user presses a non-extended key, _kbhit will still return true twice in succession, and calls to _getch() will return the key code the first time, and 0x0 the second time.

In your code, when the user presses 'w' or 'c', _kbhit will return true not just once (as you'd expect) but twice. The first time you call it, it'll return the scan code of the key, and the second it'll return a 0 byte.

What's happening in your code is that you're reading the scan code, printing something appropriately, then _kbhit is returning true again, so you read the '' byte, set b to '', and then (since you don't have any code to do anything when b is 0) you (repeatedly) do nothing until the next time the user presses a key.

Reference

https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/getch-getwch?view=vs-2017