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Question

设计一个程序根据用户的选择（1.日期转换成天数；2.指定年份和第几天求出日期）调用设计要的
程序给出正确的输出。

Answer 1

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int days[13] = { -1,31,28,31,30,31,30,31,31,30,31,30,31 };

void DateToDays()
{
    int sum = 0;
    printf("***输入年份***\n");
    int y;
    scanf("%d", &y);
    if (!(y % 4)) days[2]++;
    printf("***输入月份***\n");
    int m;
    scanf("%d", &m);
    printf("***输入日期***\n");
    int d;
    scanf("%d", &d);
    for (unsigned i = 1; i < m; ++i) {
        sum += days[i];
    }
    sum += d;
    printf("天数：%d", sum);
}

void DaysToDate() {
    printf("***输入年份***\n");
    int y;
    scanf("%d",&y);
    if (y % 4 == 0) days[2]++;
    printf("***输入天数***\n");
    int n;
    scanf("%d",&n);
    int sum[13] = {0,31};
    for (unsigned i = 2; i <= 12; ++i)sum[i] = sum[i - 1] + days[i];
    int m;
    for (m = 1; m <= 12; ++m) {
        if (sum[m] >= n) break; 
    }
    int d = n - sum[m-1];
    printf("日期：%d月%d日\n", m,d);
}

int main()
{
    int mode;
    scanf("%d", &mode);
    if (mode == 1) DateToDays();
    else DaysToDate();
    return 0;
}