输入年月日,判断第几天

主函数中的调用函数

int year = 0,month = 0,day = 0;
    printf("请输入日期:");
    scanf("%d/%d/%d",&year,&month,&day);
    int dayth = dayOfYear(year, month, day);
    printf("这是一年中的第%d天\n",dayth);

 

函数声明部分

int dayOfYear(int year,int month,int day);

 

函数实现部分

int dayOfYear(int year,int month,int day){
    int i = 1,sum = 0;
    while (i == 1) {
        
        int a[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
        
        if (year % 400 == 0 || (year % 100 != 0 && year % 4 == 0)) {
            a[1]++;
        }
        
        if (day > a[month - 1] || day <= 0 || month > 12 || month < 1) {
            printf("输入日期有误!\n请重新输入:");
            scanf("%d/%d/%d",&year,&month,&day);
        
        }else{
            for (int i = 0; i < month-1; i++) {
                sum += a[i];
            }
            sum += day;
            i = 0;
        }
        
      }
    return sum;
}