second commit

年历.c

@@ -0,0 +1,97 @@
+#define MAIN_H
+#include "stdio.h"
+#include "math.h"
+#include "stdlib.h"
+
+//获取某一个月的最大天数 
+int monthday(int,int );
+
+//判断闰年 ,是返回1，不是返回0 
+int isleapyear(int );
+
+#include<math.h>
+
+int main()
+{
+    int year,month,days,weekday;
+    int i,d;
+    while(1)
+    {
+        printf("please input the year:\n");
+        scanf("%d",&year);
+        days = year-1+(year-1)/400+(year-1)/4-(year-1)/100;//计算某年第一天是星期几 
+        
+        for(month=1;month<=12;month++)
+        {
+            printf("\n--------%d/%d--------\n",year,month);
+            printf("sun\tmon\ttues\twed\tthur\tfir\tsat\t\n");//表头
+            i = 1;    d = 1;
+            weekday = (days + 1)%7;  //求星期几 
+            while(i<=weekday)   //输出前面的空格 
+            {
+                printf("\t");
+                i++;
+            } 
+            
+            while(d<=monthday(month,year))     //输出日期 
+            {
+                weekday = (days + 1)%7;
+                if(weekday==6)   //最后一个是星期六，输出之后要换行 
+                    printf("%d\n",d);
+                else             //不是星期六的输出后不换行 
+                     printf("%d\t",d);
+                 if(d==monthday(month,year))
+                     printf("\n");
+                 d++;
+                 days++;
+            }
+        }
+    }
+    
+}
+
+#include "math.h"
+
+int monthday(int month,int year)
+{
+    switch(month)
+        {
+            case 1:
+            case 3:
+            case 5:
+            case 7:
+            case 8:
+            case 10:
+            case 12:
+            return 31;break;
+            
+            case 4:
+            case 6:
+            case 9:
+            case 11:
+            return 30;break; 
+            
+            case 2:
+            if(isleapyear(year))    
+            {
+                return 29;//闰年29天 
+                break;
+            }
+            else
+            {
+                return 28;
+                break;
+            }
+            
+        } 
+    
+}
+
+
+int isleapyear(int year)
+{
+    if((year%4==0)&&(year%100!=0)||(year%400==0))
+        return 1;
+    else 
+        return 0;
+}