C Program to store date in an integer variable

C Program to store date in an integer variable

In this example, we will see a C program through which we can store date in an integer variable.

After that, we will extract the date from that variable and print the date in DD, MM, YYYY format.

#include <stdio.h>
int main()
{
int dd,mm,yy;
int date;
printf("Enter date (dd/mm/yy) format: ");
scanf("%d/%d/%d",&dd,&mm,&yy);
printf("\nEntered date is: %02d/%02d/%04d\n",dd,mm,yy);
/*adding dd,mm,yy into date*/
/*an integer has 4 bytes and dd range is 1 to 31 , mm range is 1 to 12 which
*can be stored in 1 byte, 1 byte and in rest of 2 bytes
*we can store year.*/
date=0;
date   |= (dd&0xff); /*dd storing in byte 0*/
date   |= (mm&0xff)<<8; /*mm storing in byte 1*/
date   |= (yy&0xffff)<<16; /*yy storing in byte 2 and 3*/
printf("Date in single variable: %d [Hex: %08X] \n",date,date);
/*Extracting dd,mm,yy from date (an integer value)*/
dd = (date &0xff); /*dd from byte 0*/
mm = ((date>>8)& 0xff); /*mm from byte 1*/
yy = ((date>>16)&0xffff); /*yy from byte 2 and 3*/
printf("Date after extracting: %02d/%02d/%04d\n",dd,mm,yy);
return 0;
}