Finding Your Day of Birth Given Date of Birth in c++

by Adarsh Ramamurthy

Gives your exact day of birth from your birth date.The only input to this program is your date of birth. Based on this it calculates the day on that day. Its based on a simple mathematic problem that solves various equations to give you the required output.

#include<stdio.h><br /> #include<stdlib.h><br /> #include<conio.h></p> <p>main()<br /> {<br /> clrscr();<br /> int d,m,y,year,month,day,i,n;<br /> printf(“Enter how many times you want to run this program : “);<br /> scanf(“%d”,&n);<br /> for(i=1;i<=n;i++)<br /> {<br /> printf(”</p> <p>Enter the date : “);<br /> scanf(“%d%d%d”,&d,&m,&y);<br /> if( d>31 || m>12 || (y<1900 || y>=2000) )<br /> {<br /> printf(”</p> <p>INVALID INPUT<br /> “);<br /> getch();<br /> exit(0);<br /> }<br /> year = y-1900;<br /> year = year/4;<br /> year = year+y-1900;<br /> switch(m)<br /> {<br /> case 1:<br /> case 10:<br /> month = 1;<br /> break;<br /> case 2:<br /> case 3:<br /> case 11:<br /> month = 4;<br /> break;<br /> case 7:<br /> case 4:<br /> month = 0;<br /> break;<br /> case 5:<br /> month = 2;<br /> break;<br /> case 6:<br /> month = 5;<br /> break;<br /> case 8:<br /> month = 3;<br /> break;<br /> case 9:<br /> case 12:<br /> month = 6;<br /> break;<br /> }<br /> year = year+month;<br /> year = year+d;<br /> day = year%7;<br /> switch(day)<br /> {<br /> case 0:<br /> printf(”</p> <p>Day is SATURDAY<br /> “);<br /> break;<br /> case 1:<br /> printf(”</p> <p>Day is SUNDAY<br /> “);<br /> break;<br /> case 2:<br /> printf(”</p> <p>Day is MONDAY<br /> “);<br /> break;<br /> case 3:<br /> printf(”</p> <p>Day is TUESDAY<br /> “);<br /> break;<br /> case 4:<br /> printf(”</p> <p>Day is WEDNESDAY<br /> “);<br /> break;<br /> case 5:<br /> printf(”</p> <p>Day is THURSDAY<br /> “);<br /> break;<br /> case 6:<br /> printf(”</p> <p>Day is FRIDAY<br /> “);<br /> break;<br /> }<br /> }<br /> getch();<br /> return 0;<br /> }