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Title Calendar Program
Author Omkar & Devendra
Author Email omkarkc [at] gmail.com
Description This program prints Weekdays of specified date. It even prints calendar of a given year too.
Category C » Beginners / Lab Assignments
Hits 87708
Code Select and Copy the Code
/*OmDev's calendar library*/ #include<stdio.h> #include<string.h> #include<conio.h> int getNumberOfDays(int month,int year) { switch(month) { case 1 : return(31); case 2 : if(year%4==0) return(29); else return(28); case 3 : return(31); case 4 : return(30); case 5 : return(31); case 6 : return(30); case 7 : return(31); case 8 : return(31); case 9 : return(30); case 10: return(31); case 11: return(30); case 12: return(31); default: return(-1); } } char *getName(int odd) { switch(odd) { case 0 :return("Sunday"); case 1 :return("Monday"); case 2 :return("Tuesday"); case 3 :return("Wednesday"); case 4 :return("Thursday"); case 5 :return("Friday"); case 6 :return("Saturday"); default:return("Error in getName() module.Invalid argument passed"); } } int getOddNumber(int day,int mon,int year) { int res=0,t1,t2,y=year; year = year-1600; while(year>=100) { res=res+5; year=year-100; } res=(res%7); t1=((year-1)/4); t2=(year-1)-t1; t1=(t1*2)+t2; t1=(t1%7); res = res+t1; res=res%7; t2=0; for(t1=1;t1<mon;t1++) { t2+=getNumberOfDays(t1,y); } t2 = t2+day; t2 = t2%7; res = res+t2; res = res%7; if(y>2000) res=res+1; res = res%7; return res; } char *getWeek(int dd,int mm,int yy) { int odd; if(!(mm>=1 && mm<=12)) { return("Invalid month value"); } if(!(dd>=1 && dd<=getNumberOfDays(mm,yy))) { return("Invalid date"); } if(yy>=1600) { odd = getOddNumber(dd,mm,yy); odd=odd%7; return(getName(odd)); } else { return(" Please give year more than 1600"); } } void printMonth(int mon,int year,int x,int y) { int nod,odd,cnt,d=1,x1=x,y1=y; if(!(mon>=1 && mon<=12)) { printf(" INVALID MONTH"); getch(); return; } if(!(year>=1600)) { printf(" INVALID YEAR"); getch(); return; } if(x<=0) x=wherex(); if(y<=0) y=wherey(); gotoxy(x,y); textcolor(RED); cprintf("S"); textcolor(YELLOW); cprintf(" M T W T F S"); /* 1234567891234567891234567 */ textcolor(7); cprintf(""); y++; nod=getNumberOfDays(mon,year); odd=getOddNumber(d,mon,year); switch(odd) { case 0 : x=x; cnt=1; break; case 1 : x=x+4; cnt=2; break; case 2 : x=x+8; cnt=3; break; case 3 : x=x+12; cnt=4; break; case 4 : x=x+16; cnt=5; break; case 5 : x=x+20; cnt=6; break; case 6 : x=x+24; cnt=7; break; default : printf(" INVALID DATA FROM THE getOddNumber() MODULE"); return; } gotoxy(25,25); gotoxy(x,y); printf("%02d",d); for(d=2;d<=nod;d++) { if(cnt%7==0) { y++; cnt=0; x=x1-4; } x = x+4; cnt++; gotoxy(x,y); printf("%02d",d); } } main() { char ch='k'; int dd,mm,yy; while(ch!='0') { clrscr(); printf(" 1.Know the day"); printf(" 2.Print the month"); printf(" 0.EXIT"); printf(" ENTER YOUR CHOICE : "); flushall(); fflush(stdin); ch=getche(); clrscr(); switch(ch) { case '1': printf("Enter date (DD MM YYYY) : "); scanf("%d %d %d",&dd,&mm,&yy); printf(" Day is : %s",getWeek(dd,mm,yy)); flushall(); getch(); break; case '2' : printf("Enter month and year (MM YYYY) : "); scanf("%d %d",&mm,&yy); printf(" "); printMonth(mm,yy,-1,-1); flushall(); getch(); break; case '0' : exit(0); } } }

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