Go4Expert - Seeking Help for Code Explanation

Hi there,

I am new to c programming and I am current studying the example codes. I am having difficulty to understand the line

Code:

lcd_data(s+48);

. I wish to know what does this line meas and what will it done.

Here is the full codes:

Code:

//Program to interface IR sensor using ADC 0804. Set Vref =1.5v for ADC 0804



#include<reg51.h>

#define port P3

#define adc_input P1

#define dataport P0

#define sec 100

sbit rs = port^0;

sbit rw = port^1;

sbit e = port^2;



sbit wr= port^3;

sbit rd= port^4;

sbit intr= port^5;



int test_final=0 ,shift=0;



void delay(unsigned int msec ) // Time delay function

{

int i ,j ;

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

  for(j=0; j<1275; j++);

}



void lcd_cmd(unsigned char item) // Function to send command to LCD

{

dataport = item;

rs= 0;

rw=0;

e=1;

delay(1);

e=0;

return;

}



void lcd_data(unsigned char item)  // Function to send data to LCD

{

dataport = item;

rs= 1;

rw=0;

e=1;

delay(1);

e=0;

return;

}



void lcd_data_string(unsigned char *str) // Function to send string to LCD

{

int i=0;

while(str[i]!='\0')

{

  lcd_data(str[i]);

  i++;

  delay(1);

}

return;

}



void convert()

{

int s;

lcd_cmd(0x81);

delay(2);

lcd_data_string("output:");

s=test_final/100;

test_final=test_final%100;

lcd_cmd(0x8a);

if(s!=0)

lcd_data(s+48);

else

lcd_cmd(0x06);

s=test_final/10;

test_final=test_final%10;

lcd_data(s+48);

lcd_data(test_final+48);

lcd_data(' ');

if(shift>16)

{

lcd_cmd(0xc0+(shift-1));

lcd_data_string("       ");

shift=0; 

}

lcd_cmd(0xc0+(shift-1));

lcd_data(' ');

lcd_cmd(0xc0+shift);

lcd_data_string("CALIBRATE IT");

delay(30);

}



void main()

{

adc_input=0xff;

lcd_cmd(0x38);  //2 Line, 5X7 Matrix

lcd_cmd(0x0c);  //Display On, Cursor Blink

delay(2);

lcd_cmd(0x01);  // Clear Screen

delay(2);

lcd_cmd(0x81);  // Setting cursor to first position of first line

delay(2);

while(1)

{

  shift++;

  delay(1);

  rd=1;

  wr=0;

  delay(1);

  wr=1;

  while(intr==1);

  rd=0;

  test_final=adc_input;

  delay(1);

  intr=1;

  convert();

}

}

Please guide me through and I will appreciate it very much.:worried: