1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <math.h>
4 #define ISYEAR(year) (year%400==0) ||(year%4==0&&year%100!=0)
5 int DayofYear(int year, int month, int day);
6
7
8 int main(int argc, char *argv[])
9 {
10 int year1, month1, day1;
11 int year2, month2, day2;
12 int syear = 0, sday = 0, deltdate = 0;
13 int date1, date2, date;
14 int mon1[] = {0,31,29,31,30,31,30,31,31,30,31,30,31}; //闰年二月29天
15 int mon2[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
16 int i;
17 printf("输入第一个日期(例如：2010-1-17)");
18 scanf("%d-%d-%d",&year1, &month1, &day1);
19 //检查输入的日期是否合法
20 if(year1<1){
21 printf("年份非法，重新输入");
22 scanf("%d-%d-%d",&year1, &month1, &day1);
23 }
24 else if(ISYEAR(year1)){
25 if(month1<1||month1>12){
26 printf("月份非法，重新输入");
27 scanf("%d-%d-%d",&year1, &month1, &day1);
28 }
29 else{
30 if(day1 > mon1[month1]||day1<1){
31 printf("日期非法，重新输入");
32 scanf("%d-%d-%d",&year1, &month1, &day1);
33 }
34 }
35 }
36 else {
37 if(month1<1||month1>12){
38 printf("月份非法，重新输入");
39 scanf("%d-%d-%d",&year1, &month1, &day1);
40 }
41 else{
42 if(day1 > mon2[month1]||day1<1){
43 printf("日期非法，重新输入");
44 scanf("%d-%d-%d",&year1, &month1, &day1);
45 }
46 }
47 }
48 //getchar();
49 printf("输入第二个日期(例如：2015-4-29)");
50 scanf("%d-%d-%d",&year2, &month2, &day2);
51 if(year2<1){
52 printf("年份不合法，请重新输入");
53 scanf("%d-%d-%d",&year2, &month2, &day2);
54 }
55 if(month2<1 || month2>12){
56 printf("月份不合法，请重新输入");
57 scanf("%d-%d-%d",&year2, &month2, &day2);
58 }
59 if(ISYEAR(year2)){
60 if(day2>mon1[month2]||day2<1){
61 printf("日期非法，请重新输入");
62 scanf("%d-%d-%d",&year2, &month2, &day2);
63 }
64 }
65 else{
66 if(day2>mon2[month2]||day2<1){
67 printf("日期非法，请重新输入");
68 scanf("%d-%d-%d",&year2, &month2, &day2);
69 }
70 }
71
72 //分别计算两个日期距离当年1月1日的天数
73 date1 = DayofYear(year1,month1,day1);
74 date2 = DayofYear(year2,month2,day2);
75 //默认year1<year2
76 if(year1==year2){
77 if(date1>date2)
78 deltdate = date1 - date2;
79 else
80 deltdate = date2 - date1;
81 }
82 else if(year1<year2){
83 for(i=year1;i<year2;i++){
84 if(ISYEAR(i))
85 syear += 366;
86 else
87 syear += 365;
88 }
89 deltdate = syear - date1 + date2;
90 }
91 else{
92 for(i=year1;i>year2;i--){
93 if(ISYEAR(i))
94 syear += 366;
95 else
96 syear += 365;
97 }
98 deltdate = syear - date1 + date2;
99 }
100
101 printf("\n%d年%d天%d日距离%d年%d天%d日相隔%d天.\n\n",year2,month2,day2,year1,month1,day1,deltdate);
102 system("pause");
103 return 0;
104 }
105
106
107 #define ISYEAR(year) (year%400==0) ||(year%4==0&&year%100!=0)
108
109 int DayofYear(int year, int month, int day)
110 {
111 int sum = 0;
112 int index = 0;
113 for(index=1;index<month;index++){
114 switch(index){
115 case 1:
116 case 3:
117 case 5:
118 case 7:
119 case 8:
120 case 10:
121 case 12:
122 sum += 31;
123 break;
124 case 2:
125 if(ISYEAR(year)){
126 sum += 29;
127 }
128 else
129 sum +=28;
130 break;
131 case 4:
132 case 6:
133 case 9:
134 case 11:
135 sum += 30;
136 break;
137
138 }
139 }
140 sum += day;
141 return sum;
142 }
