C语言，输入年月日，判断是否有效，并且输出"年月日st nd rd th"
#include
#include
#include"string.h"
int main(int argc,const char * argv[]) {
int year=0;int month=0;int day=0;
int max_day=0;
printf("请输入2000 05 20格式的年月日\n");
scanf("%d %d %d",&year,&month,&day);
printf("%d %d %d\n",year,month,day);
enum monthlist{january=1,feburary,march,april,may,june,july,august,september,october,november,december};
//enum monthlist today=january;
printf("%d ",year);//先输出年
//下面输出月*********
if(month>0&&month<13){
switch (month) {
casejanuary:
printf("january");
break;
casefeburary:
printf("feburary");
break;
casemarch:
printf("march");
break;
caseapril:
printf("april");
break;
casemay:
printf("may");
break;
casejune:
printf("june");
break;
casejuly:
printf("july");
break;
caseaugust:
printf("august");
break;
caseseptember:
printf("september");
break;
caseoctober:
printf("october");
break;
casenovember:
printf("november");
break;
casedecember:
printf("december");
break;
default:
break;
}
}else{
printf("\n该%d不存在%d月",year,month);
}
/***此处加一个判断，每月最大天数*/
switch (month) {
case1:case3:case5:case7:case8:case10:case12:
max_day=31;
break;
case4:case6:case9:case11:
max_day=30;
case2:
if(year%400==0||(year%4==0&&year%100!=0)){
max_day=29;
}else{
max_day=28;
}
default:
break;
}
/*下面输出天数，并带有后缀*/
if(day>0&&day<=max_day){
if(day%10==1&&day!=11){
printf(" %dth\n",day);
}elseif(day%10==2&&day!=12){
printf(" %dnd\n",day);
}
elseif(day%10==3&&day!=13){
printf(" %drd\n",day);
}else{
printf(" %dth\n",day);
}
}else{
printf("\n%d月不存在%d天\n",month,day);
}
}