Thread: How to get scan code of ESC key?

i wrote the following code :

Code:

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


int a[][4] = {15,9,10,25,6,2,4,7,32,19,42,8,21,17,18,0};
void boxes();
void display();


void main()
{
    int ch,r=3,c=3,t;
    clrscr();


    gotoxy(20,7);    printf("USE ARROW KEYS TO PLAY THIS GAME");
    gotoxy(20,8);    printf("--------------------------------");
    boxes(),
    display();


    while(1)
    {
        ch=getch();
        if(ch==0 || ch==224)
        {
            switch(getch())
            {
                    case 72:
                            if(r!=0)
                            {
                                t=a[r][c];
                                a[r][c]=a[r-1][c];
                                a[r-1][c]=t;
                                display();    r--;
                            }
                            else
                                printf("\a");
                            break;


                    case 80:
                            if(r!=3)
                            {
                                t=a[r][c];
                                a[r][c]=a[r+1][c];
                                a[r+1][c]=t;
                                display();    r++;
                            }
                            else
                                printf("\a");
                            break;


                    case 75:
                            if(c!=0)
                            {
                                t=a[r][c];
                                a[r][c]=a[r][c-1];
                                a[r][c-1]=t;
                                display();    c--;
                            }
                            else
                                printf("\a");
                            break;


                    case 77:
                            if(c!=3)
                            {
                                t=a[r][c];
                                a[r][c]=a[r][c+1];
                                a[r][c+1]=t;
                                display();    c++;
                            }
                            else
                                printf("\a");
                            break;


                    case 1:
                            exit(1);


                    default:
                        printf("\a");
            }
        }
    }
    getch();
}
void boxes()
{
    int c,r;
    gotoxy(20,10);    printf("%c",218);
    gotoxy(32,10);    printf("%c",191);
    gotoxy(20,18);    printf("%c",192);
    gotoxy(32,18);    printf("%c",217);


    for(c=21;c<32;c++)
    {
        gotoxy(c,10);    printf("%c",196);
        gotoxy(c,12);    printf("%c",196);
        gotoxy(c,14);    printf("%c",196);
        gotoxy(c,16);    printf("%c",196);
        gotoxy(c,18);    printf("%c",196);
    }


    for(r=11;r<18;r+=2)
    {
        gotoxy(20,r);    printf("%c",179);
        gotoxy(23,r);    printf("%c",179);
        gotoxy(26,r);    printf("%c",179);
        gotoxy(29,r);    printf("%c",179);
        gotoxy(32,r);    printf("%c",179);
    }


    for(c=23;c<30;c+=3)
    {
        gotoxy(c,10);    printf("%c",194);
        gotoxy(c,18);    printf("%c",193);
    }


    for(r=12;r<17;r+=2)
    {
        gotoxy(20,r);    printf("%c",195);
        gotoxy(32,r);    printf("%c",180);
    }


    for(c=23;c<30;c+=3)
    {
        gotoxy(c,12);    printf("%c",197);
        gotoxy(c,14);    printf("%c",197);
        gotoxy(c,16);    printf("%c",197);
    }
}
void display()
{
    int i,j,r=11,c=21;


    for(i=0;i<4;i++)
    {
        for(j=0;j<4;j++)
        {
            gotoxy(c,r);
            if(a[i][j]!=0)
                printf("%d",a[i][j]);
            else
                printf("  ");
            c+=3;
        }
        r+=2;    c=21;
    }

}

not able to esc when i press esc key.how to get rid of this.

FAQ > Use directional keys in a console application - Cprogramming.com

I think keycode for ESC is ASCII 27.

Originally Posted by laughing_man

I think keycode for ESC is ASCII 27.

The ASCII 27 control has nothing to do with the escape key on the keyboard.

Originally Posted by wikipedia

Even though many control characters are rarely used, the concept of sending device-control information intermixed with printable characters is so useful that device makers found a way to send hundreds of device instructions. Specifically, they used ASCII code 27 (escape), followed by a series of characters called a "control sequence" or "escape sequence". The mechanism was invented by Bob Bemer, the father of ASCII.

(source)