2014年第五届蓝桥杯C/C++ A组国赛 —— 第三题:日期差
标题:日期差
历史上,不同的人类聚居地可能有不同的历法,因而记录下来的资料中日期的换算就很麻烦。幸好今天我们统一使用公元纪年法。当然,这种历法对求两个日期差多少天也不是十分简便,但毕竟是可以忍受的。
下面的程序计算了两个日期的差值,两个日期都使用公元纪年法。
请分析程序逻辑,并推断划线部分缺失的代码。
int to_day(int y, int m, int d)
{
int mon[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int day = 0;
int i;
for(i=1; i<y; i++){
day += (i%4==0 && i%100!=0 || i%400==0)? 366 : 365;
}
if(y%4==0 && y%100!=0 || y%400==0) mon[2]++;
for(i=1; i<m; i++){
_____________________; //填空位置
}
return day + d;
}
int diff(int y1, int m1, int d1, int y2, int m2, int d2)
{
int a = to_day(y1, m1, d1);
int b = to_day(y2, m2, d2);
return b-a;
}
int main()
{
int n = diff(1864,12,31,1865,1,1);
printf("%d\n", n);
return 0;
}
注意:通过浏览器提交答案。只填写缺少的内容,不要填写任何多余的内容(例如:说明性文字或已有符号)。
Code
/*
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*/
/* Procedural objectives:
Variables required by the program:
Procedural thinking:
Functions required by the program:
Determination algorithm:
Determining data structure:
*/
/* My dear Max said:
"I like you,
So the first bunch of sunshine I saw in the morning is you,
The first gentle breeze that passed through my ear is you,
The first star I see is also you.
The world I see is all your shadow."
FIGHTING FOR OUR FUTURE!!!
*/
#include <cstdio>
int to_day(int y, int m, int d)
{
int mon[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int day = 0;
int i;
for(i=1; i<y; i++){
day += (i%4==0 && i%100!=0 || i%400==0)? 366 : 365;
}
if(y%4==0 && y%100!=0 || y%400==0) mon[2]++;
for(i=1; i<m; i++){
day += mon[i]; //填空位置
}
return day + d;
}
int diff(int y1, int m1, int d1, int y2, int m2, int d2)
{
int a = to_day(y1, m1, d1);
int b = to_day(y2, m2, d2);
return b-a;
}
int main()
{
int n = diff(1864,12,31,1865,1,1);
printf("%d\n", n);
return 0;
}