Actually wat u told earlier is correct, am using 4 * 4 keypad but am not masking any port make it has 4 bit use. But the thing is am getting right answer when i simulate the code means that seven_seg value. but its not displaying anything on the seven segment...
my indentation and punctuation are followed correctly but when i post this message it wil come like that i don't how i have to insert code in this, is der any procedure to insert code in this, if der is plz tel me sir

# include <reg51.h>
# include <stdio.h>

# define ROW P1
# define COL P2
# define SEVEN_SEG P3

char keypad [4][4] = { 0, 1, 2, 3,
4, 5, 6, 7,
8, 9, 10, 11,
12, 13, 14, 15 };

char seven_seg [ ] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x69,
0x6f, 0x79,0x63, 0xc7, 0x77, 0x63 };
//seven_seg used to display characters from zero to fifteen


void main ( ) {
char temp, row, col, count;
ROW = 0x0F;
COL = 0x00;
SEVEN_SEG = 0x00;

while ( 1 ) {
COL = 0x0F;
ROW = 0x00;
while ( !( ROW & 0x0F ) );
for ( temp = 0x01, count = 0; temp <= 0x08; temp <<= 1, count++ )
if ( temp & ROW ) {
row = count ;
break;
}

for ( COL = 0x01, temp = 0x01, col = count = 0; temp <= 0x08;
COL = (temp <<= 1), count++ )
if ( row & ROW ) {
col = count;
break;
}

temp = keypad [row][col];
SEVEN_SEG = seven_seg [temp];
}
}


Thank u for ur reply sir