原题链接:[编程入门]结构体之时间设计
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#include <stdio.h> int main() { struct date { int year; int month; int day; }; struct date a; int sum = 0; scanf("%d%d%d", &a.year, &a.month, &a.day); for (int i = 1; i <= a.month; i++) { if (i == a.month) { sum += a.day; } else { switch (i) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: sum += 31; break; case 2: if ((a.year % 4 == 0 && a.year % 100 != 0) || a.year % 400 == 0) sum += 29; else sum += 28; break; case 4: case 6: case 9: case 11: sum += 30; break;#include <stdio.h> #include <stdlib.h> #include <string.h> struct str{ int year; int month; int day; };//注意这里的结尾处冒号 int isleapyear(int x); void main() { int sum=0; struct str stu; scanf("%d %d %d", &stu.year,&stu.month,&stu.day); int arr[12]={31,28,31,30,31,30,31,31,30,31,30,31}; for(int i=0;i<stu.month-1;i++) { sum+=arr[i]; } if(isleapyear(stu.year)) sum=sum+stu.day+1; else sum=sum+stu.day; printf("%d",sum); system("pause"); } int isleapyear(int x) { if(x%4==0 && x%100==0 || x%400==0) return 1; else#include<stdio.h> #include<math.h> int main() { int sum; struct { int y; int m; int d; }a; scanf("%d%d%d",&a.y,&a.m,&a.d); switch (a.m) { case 1: sum=a.d;break; case 2: sum=31+a.d;break; case 3: sum=31+28+a.d;break; case 4: sum=31+28+31+a.d;break; case 5: sum=31+28+31+30+a.d;break; case 6: sum=31+28+31+30+31+a.d;break; case 7: sum=31+28+31+30+31+30+a.d;break; case 8: sum=31+28+31+30+31+30+31+a.d;break; case 9: sum=31+28+31+30+31+30+31+31+a.d;break; case 10: sum=31+28+31+30+31+30+31+31+30+a.d;break; case 11: sum=31+28+3