Page 179 - C Programming

#include <stdio.h>

#include <conio.h>

main()

{ char cont_out[4]={0x0e,0x0d,0x0b,0x07};

char matrix_sw,digit,data,i;clrscr();

gotoxy(30,10); printf(“PROGRAM MATRIX SWITCH”);

gotoxy(34,12); cprintf(“0 1 2 3”);

gotoxy(34,13); cprintf(“4 5 6 7”);

gotoxy(34,14); cprintf(“8 9 a b”);

gotoxy(34,15); cprintf(“c d e f”);

do{

for(i=0;i<4;i++)

{

outport(0x378,cont_out[i]);

matrix_sw=inport(0x379);

if(matrix_sw==112)

{ data=0+i*4;

digit=0;

}