Pressing keys in the terminal

Question

Hello, in my Ubuntu 16.04, at the time of running a program in C (as well as in sublime), when I press a key, keeps repeating the same key until release. So far so good. But if I don’t release this key and I press another key, this one keeps repeating and it’s like I’ve released the first key.

There is a way to check if both keys are pressed simultaneously?

Answer 1

There are keys and keys. You cannot read (through a scanf) for example the combination of keys A and B pressed at the same time, as it is not a character, it simply does not exist AB.

To use some key combination Voce will have to use the following: CTRL, ALT and SHIFT, combined with some character key, i.e., the characters from A to Z.

Note that all program shortcuts are CTRL + (A-Z), ALT + (A-Z) or SHIFT + (A-Z) it is also common to use the keys F(1-12) (Functions Keys).

In reality some combinations of these keys emit a non-printable character, a control character that your software can use to perform some specific function.

Compile this code and see the value difference in key combinations with CTRL, ALT and SHIFT.

#include <stdlib.h>
#include <stdio.h>

int main()
{
    unsigned char key;

    printf("press any key:>");
    scanf("%c", &key);
    printf("key pressed:>%X \n", key);

    return 0;
}