语言编程中返回false和true的易错点

bool Date::Legal(int y, int m, int d) {
int timeLimit=31;
//先返回假
if (y < 0 || y > 9999)
return false;
if (m < 0 || m>12)
return false;
switch (m)
{
case 4:
timeLimit--; break;
case 6:
timeLimit--; break;
case 9:
timeLimit--; break;
case 11:
timeLimit--; break;
case 2:
IsLeapYear(y) ? timeLimit = 29 : timeLimit = 28;
break;
}
if (d > timeLimit)
return false;
return true;

}