蓝桥杯算法提高VIP-任意年月日历输出 （C语言代码）

解题思路:





注意事项:





参考代码:

#include<stdio.h>
#include<math.h>
int monthday(int year,int month);
int gapday(int year1,int year2,int month2);
void print(int month,int gap,int year);
int main()
{
        int year,month;
        int gap,i,k;
        char s1[100]="---------------------\n"
                 " Su Mo Tu We Th Fr Sa\n"
                 "---------------------";
        char s2[50]="---------------------";
        scanf("%d %d",&year,&month);
        if(year>=2007)
        {
                gap=gapday(2007,year,month)%7;
                gap=(gap+1)%7;
                puts(s1);
                print(month,gap,year);
                putchar('\n');
                puts(s2);
        }
        return 0;
}
int monthday(int year,int month)
{
        if(month==2)
        {
                if(year%4==0&&year%100!=0||year%400==0)  return 29;
                else    return 28;
        }
        else
        switch(month)
        {
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                        return 31; break;
                default:
                        return 30; break;
        }
}
int gapday(int year1,int year2,int month2)
{
        int i,sum=0;
        for(i=year1;i<year2;i++)
        {
                if(i%4==0&&i%100!=0||i%400==0)  sum+=366;
                else    sum+=365;
        }
        for(i=1;i<month2;i++)   sum+=monthday(year2,i);
        return sum;
}
void print(int month,int gap,int year)
{
        int i=gap,k;
        while(i--)
        {
                printf("   ");
        }
        k=monthday(year,month);
        for(i=1;i<=k;i++)
        {
                printf("%3d",i);
                if(i%7==7-gap&&i<k)
                {
                        putchar('\n');
                }
        }
}