/ * * Purpose: To generate a calender. * Author: M J Leslie * Date: 19-Mar-94 */ #include <stdio.h> #define TRUE 1 #define FALSE 0 #define DAYS_IN_A_WEEK 7 #define MAX_COLS 6 #define BASE_YEAR 1990 /* Year from which all calculations are done. */ /* Function declatations */ int calender_month(const int month, const int year); int start_day(const int month, const int year); int leap(int); /* Global variables. */ int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31}; main(int argc, char *argv[]) { int i; /* General purpose var */ int year; /* year to start display */ int num_of_months; /* Number of months */ int start_month; /* Start month */ int month; /* Current month */ char *prog=argv[0]; /* Program name */ /* Check we have the program name and 3 parms */ if ( argc != 4) { puts("\tProgram syntax:"); printf("\t\t%s start_month start_year num_of_months",prog ); exit(1); } /* Dont bother checking if the parms are integers!! */ /* Put command line parms into meaningfull variable names */ start_month = atoi(argv[1]); year = atoi(argv[2]); num_of_months = atoi(argv[3]); /* AND OFF WE GO... */ month = start_month; for (i=start_month; i < start_month + num_of_months ; i++) { calender_month(month, year); /* O/P one month. */ if ( month++ >= 12) /* Q. End of year? */ { /* Yes. */ month = 1; year++; } } } /************************************************************************/ /* Calender_month */ /* Display one calender month. */ /************************************************************************/ calender_month(const int month, const int year) { int i,j,count; /* General Purpose variables. */ /* dont forget - arrays start at zero */ char *days[]= { " ", "Mon", "Tue", "Wed", "Thr", "Fri", "Sat", "Sun" }; char *months[]= { " ", "January", "Febuary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; int month_map[8][MAX_COLS+1]={0}; /* init array with zeros */ j=start_day(month, year); /* Get the day the month starts */ /* Build the calender values */ i=1;count=0; while ( days_in_month[month] > count) { month_map[j++][i]=++count; /* Build the table. */ /* Start a new week. */ if ( j > DAYS_IN_A_WEEK) { j=1; i++; } } /* O/P Title bar. */ printf("\n\t\t%s %d\n\n",months[month], year); /* O/P the calender */ for (j=1; j<=DAYS_IN_A_WEEK; j++) { printf("\t%s ",days[j]); /* Day names */ for (i=1; i<=MAX_COLS; i++) { if ( month_map[j][i] == 0 ) /* dates */ {printf (" ");} else {printf ("%2d ", month_map[j][i]);} } puts (""); /* puts supplies a Newline */ } } /************************************************************************/ /* Start_day */ /* Work out which day the month starts on. */ /************************************************************************/ int start_day(const int month, const int year) { int day=1; /* 1/1/1990 was a Monday. */ int i,j; /* GP work variable. */ /* Count days in the year. */ i = BASE_YEAR; while ( i < year ) { leap(i); /* Check for leap years */ for (j=1; j<=12; j++) day = day + days_in_month[j]; i++; } /* Count upto the month required */ i=1; leap(year); /* Check for leap years */ while ( i < month ) { day = day + days_in_month[i++]; } /* Get modulo and return it as the start day for this month */ if ( (day = day%7) == 0 ) day = 7; /* correct 0 to 7 */ return ( day ); } /************************************************************************/ /* leap */ /* Find leap years. */ /* Returns 0 - Not a leap year. */ /* 1 - leap year. */ /************************************************************************/ int leap(int year) { /* A leap year follows the following rules: if divisable by 4 and not 100 its a leap year. if divisable by 400 it is a leap year. */ if ( (year%4 == FALSE && year%100 != FALSE) || year%400 == FALSE ) { days_in_month[2] = 29; return(1); /* leap year */ } else { days_in_month[2] = 28; return(0); /* NOT a leap year */ } }
file: /Techref/language/ccpp/cref/PROBLEMS/calender.c, 4KB, , updated: 1997/7/8 13:34, local time: 2024/8/14 15:20,
52.14.214.177:LOG IN
|
©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://piclist.com/techref/language/ccpp/cref/PROBLEMS/calender.c"> language ccpp cref PROBLEMS calender</A> |
Did you find what you needed? |
![]() o List host: MIT, Site host massmind.org, Top posters @none found - Page Editors: James Newton, David Cary, and YOU! * Roman Black of Black Robotics donates from sales of Linistep stepper controller kits. * Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters. * Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated! * Contributors: Richard Seriani, Sr. |
Welcome to piclist.com! |
.