Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Describe the below c program.

 

#include <stdio.h>
#include <stdlib.h>

int get_1st_weekday(int year){

int d;
d = (((year - 1) * 365) + ((year - 1) / 4) - ((year - 1) / 100) + ((year) / 400) + 1) % 7;
return d;
}

int main()
{
system("Color 3F");
int year,month,day,daysInMonth,weekDay=0,startingDay;
printf("\nEnter your desired year:");
scanf("%d",&year);

char *months[]={"January","February","March","April","May","June","July","August","September","October","November","December"};
int monthDay[]={31,28,31,30,31,30,31,31,30,31,30,31};

if((year%4==0&&year%100!=0)||year%400==0)
monthDay[1]=29;

startingDay=get_1st_weekday(year);

for(month=0;month<12;month++){

daysInMonth=monthDay[month];
printf("\n\n---------------%s-------------------\n",months[month]);
printf("\n Sun Mon Tue Wed Thurs Fri Sat\n");

for(weekDay=0;weekDay<startingDay;weekDay++)
printf(" ");

for(day=1;day<=daysInMonth;day++){
printf("%5d",day);

if(++weekDay>6){
printf("\n");
weekDay=0;
}
startingDay=weekDay;
}

}


}

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