Key Input

[Ruski]

How can you catch a key input? I mean you've got a menu, 1. New Game, 2. Exit Game and you get to choose 1 or 2. I only know how to make it with the cin but I kinda want it on KeyPress, not type a number and press enter, just press the key and an action happens.
Thanks

[shaik786]

What compiler are you using? check to see if it supports getch()

[Ruski]

Dev-C++, cant check cuz it's got no help files...

[shaik786]

Try including getch() in your code and make. If your linker gives no error, means this function is supported, else no.
Also, search the web for documentation on your compiler.

[Ruski]

I'm a beginner, so what do you mean including? How?
Thanks

[shaik786]

What version of DEV-C++?

[Kyoto Oshiro]

Ruski,
For doing that, you just set your variable equal to getch(); Such as...

#include <iostream.h>
#include <conio.h>
int main()
{
int Keypressed;
cout<< "Main Menu\n\n";
cout<< "1. New Game\n";
cout<< "2. Exit\n";
Keypressed = getch();

if (Keypressed == 1)
// etc.
} // end of main

Or, I would make the variable you are inputting a string. I know that it is irritating having a little pause, but try entering a letter when asking for an integer. Not pretty, the screen fills up with repeats of your question.
Hope that helps, post again for clarification or more examples.

[sriharsha]

Hello Friend!!
Whenever u accept a key using getch(), the prototype u need to define is char,insted of integer,though u r accepting int. Then try converting that into integer,which is so simple. the example code is given here.

#include<stdio.h>
#include<conio.h>
void main()
{
int key;
printf("\n1.New Game");
printf("\n2.Exit Game");
key=getch();
if ((int)key==49)
printf("New Game activated");
if ((int)key==50)
printf("Exit Game activated");
}

here (int)key is typecasts the charcter to int. The ASCII equivalent to 1 is 49 and that of 2 is 50. U can even check by putting them in a switch case.

Hope u understood the concept. If any querries, mail me at [email protected]

[Ruski]

Thanks

[ChrisMUK]

Right im also looking for something to do that..... i got that part working but how can i then get it to go to say the game?

Im not making a game just an example.

[Hammer]

>void main()
This is incorrect, use should use "int main(void)".

>int key;
>if ((int)key==49)
>here (int)key is typecasts the charcter to int.
Not exactly, key is already an int because that's how is was declared. Therefore the cast isn't necessary.

>if ((int)key==49)
Rather than coding the ASCII value of the character, you could use the character constant, like so:
>if (key=='1')
This makes things easier to read.

>i got that part working but how can i then get it to go to say the game?
Does this example help?:

#include <stdio.h>
#include <conio.h>

void TheGame(void)
{
    printf("The game has been activated\n");
}

int main(void)
{
    int key, StillGoing = 1;

    while (StillGoing)
    {
        printf("--- Menu ---\n1.New Game\n2.Exit Game\n>");
        switch (key = getch())
        {
        case '1':   TheGame(); break;
        case '2':   StillGoing = 0; break;
        default:    printf("Option Invalid: %c\n", key); break;
        }
    }

    printf ("Exiting\n");
    return(0);
}

[VBprogrammer]

void main()

LOL, nothing annoys a C programmer more than that...well us assembly programmers maybe, but thats a whole other kettle of fish.

[Hershlag]

that's because C programmers are under the dilusion that they are the super, low-level geniuses. when an assembler freak comes along they are blown away by reality. C is really like straddling the fence. Assembler or C++ only in my book! C is an outdated version of C++!

Sorry, this is my first time trolling.

[Hammer]

>that's because C programmers are under the dilusion that they are the super, low-level geniuses.
Yes.. and?

>when an assembler freak comes along they are blown away by reality.
Not really, it's two different worlds, I don't think a direct comparison works. But I do appreciate the assembler lanuage, and the people that know a lot about it.

>C is really like straddling the fence.
What fence?!

>C is an outdated version of C++!
Oh no, not the C vs C++ argument!

>Sorry, this is my first time trolling.
Well, I'm not going to provoke you by replying to this thread. Oh dammit, I just did

[Ruski]

Thanks for the help