C语言-三天打鱼两天晒网

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#include<stdio.h>//起点为1990.1.1，要求小于1990年或者不合法的输入皆输出Invalid inputconst int START=1990;const int MONTH[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};int BetDays(int,int,int);int IsLeap(int year);int main(){    int bet;    int year,month,day;    int result=0;    scanf("%d %d %d",&year,&month,&day);    if(year<1990)printf("Invalid input\n");    else if(month<1||month>12)printf("Invalid input\n");    else if(day<1||day>MONTH[IsLeap(year)][month])printf("Invalid input\n");    else{        bet=BetDays(year,month,day);        result=bet%5;        switch(result)        {        case 1:        case 2:        case 3:            printf("He is working");            break;        case 4:        case 0:            printf("He is having a rest");            break;        }    }    return 0;}int IsLeap(int year){    return (year%400==0)||((year%4==0)&&(year%100!=0));}int BetDays(int year,int month,int day){    int bet=0;    int i,j;    int x,y;    for(i=1990;i<year;i++){        for(j=1;j<13;j++){            bet+=MONTH[IsLeap(i)][j];        }    }    for(x=1;x<month;x++){        bet+=MONTH[IsLeap(year)][x];    }    bet+=day;    return bet;}

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