可以设置一个while循环在其体内输入数据，经判断输入正确则跳出循环，否则提示重新输入，直到输入正确。举例代码如下：
//#include "stdafx.h"//If the vc++6.0, with this line.#include "stdio.h"
int main(void){
int m[12]={31,28,31,30,31,30,31,31,30,31,30,31},year,month
while(1){//这个循环就是解决输入错误的
printf("Please enter the year & month...\n")
fflush(stdin)
if(scanf("%d%d",&year,&month) && year>0 && month>0 && month<13)
break
printf("Error, redo: ")
}
m[1]+=year%4==0 && year%100!=0 || year%400==0
printf("%d/%d is %d days.\n",month,year,m[month-1])
return 0
}
cin>>sthwhile(!check(sth))
{
//check
函数检查输入值，如果满足就不需要在输入，这是就返回1或者true
cout<<"enter
again,
because
it
is
invalidate"
cin>>sth
}
