This coding will determine what day you were borned . Please have a try :')

Birth-DAY

#include<stdio.h>
int main ()
{
	int day,month,yf,yb,w,ans;
	
	printf("\tThis is a program to determine your day of born by using your birth date\n\n");
	printf("Please enter the information needed \n");

	printf("Date of birth : ");
	scanf("%d", &day);
	
	printf("\n\nNotes: Please enter your month according to this : \n\n\n");
	printf("January = 11 \n");
	printf("February = 12 \n");
	printf("Mac = 1 \n");
	printf("April = 2 \n");
	printf("May = 3 \n");
	printf("June = 4 \n");
	printf("July = 5 \n");
	printf("August = 6 \n");
	printf("September = 7 \n");
	printf("October = 8 \n");
	printf("November = 9 \n");
	printf("Disember = 10 \n");
	
	printf("\nMonth : ");
	scanf("%d", &month);

	printf("\nFirst 2 digit in Year you were borned : ");
	scanf("%d", &yf);

	printf("\nLast 2 digit in Year you were borned : ");
	scanf("%d", &yb);
	
	if (month==11 || month ==12)
		yb=yb-1;

	
	//formula//
	
	w=day+(2.6*month-0.2)-2*yf+yb+(yb/4)+(yf/4);
	
//	printf("\n %d \n",w);
	
	ans= w % 7;
	
	printf("\n\n");
	
	if(ans==0)
		printf("Your birthday is on Sunday\n");
	
	else if(ans==1)
		printf("Your birthday is on Monday\n");
	
	else if(ans==2)
		printf("Your birthday is on Tuesday\n");
	
	else if(ans==3)	
		printf("Your birthday is on Wednesday\n");
	
	else if(ans==4)
		printf("Your birthday is on Thursday\n");
	
	else if(ans==5)
		printf("Your birthday is on Friday\n"); 
	
	else if(ans==6)		
		printf("Your birthday is on Saturday\n");
	

	return 0;
}