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.