简易的万年历程序C语言

#include<stdio.h>#include<stdlib.h>int boolen(int y){int c;if((y%400==0)||((y%4==0)&&(y%100!=0)))c=1;else c=0;return (c);}int tianshu(int year,int month)        //计算天数函数{int i,days;i=boolen(year);switch(month){case 1:case 3:case 5:case 7:case 8:case 10:case 12:days=31; break;case 2:if(i)   days=29;   else days=28;break;default:days=30;break;}return days;}void main(){int i,m,n,totoldays=0,year,month;    //m是循环变量，i是布尔类型，n是天数int empty,day[32]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31};printf("\t\t\t*********************************\n\t\t\t*\t\t\t\t*\n\t\t\t*\t\t\t\t*\n\t\t\t$        自制精美万年历\t\t$\n\t\t\t*\t\t\t\t*\n\t\t\t*\t\t\t\t*\n\t\t\t*********************************\n\n");   //万年历界面printf("\t\t\t请输入年份：");scanf("%d",&year);printf("\t\t\t请输入月份：");scanf("%d",&month);if(year<1900)printf("输入年份不能小于1900年，请重新输入\n"),exit(1);if(boolen(year))printf("\t\t\t%d年是闰年,有%d天\n",year,year,month,tianshu(year,month));elseprintf("\t\t\t%d年是非闰年，%d年%d月有%d天\n",year,year,month,tianshu(year,month));printf("\n");printf("\t星期天\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六\n");for(m=1900;m<year;m++){i=boolen(m+1);if(i)totoldays+=366;else totoldays+=365;}for(n=1;n<month;n++){totoldays+=tianshu(year,n);}if(boolen(i)){empty=1+totoldays%7;}else {empty=totoldays%7;}if(empty==7)empty=0;//printf("%d",empty);for(m=0;m<empty;m++){printf("\t");}for(m=0;m<tianshu(year,month);m++){if((m+empty)%7==0)printf("\n");printf("\t  %d",day[m]);}printf("\n");system("pause");}