在函数体的“出口处”,对 return 语句的正确性和效率进行检查。
如果函数有返回值,那么函数的“出口处”是 return 语句。
我们不要轻视 return 语 句。如果 return 语句写得不好,函数要么出错,要么效率低下。
1 #include <iostream> 2 #include <time.h> 3 4 using namespace std; 5 6 //main()函数的定义 7 8 int main(int argc, char** argv) { 9 //声明time_t类型的变量,其以秒为单位存放系统时间 10 time_t current_time; 11 12 //得到当前的系统时间(秒) 13 time(¤t_time); 14 15 //转换系统时间为tm结构的时间信息 16 tm *ptime=gmtime(¤t_time); 17 18 //显示time_t结构的时间 19 cout<<"current_time:"<<current_time<<endl; 20 21 //显示tm结构的时间信息 22 cout<<"seconds after the minute:"<<(ptime->tm_sec)<<endl; 23 cout<<"minutes after the hour:"<<(ptime->tm_min)<<endl; 24 cout<<"hours since midnight:"<<(ptime->tm_hour)<<endl; 25 cout<<"day of the month:"<<(ptime->tm_mday)<<endl; 26 cout<<"months since January:"<<(ptime->tm_mon)<<endl; 27 cout<<"years since 1900:"<<(ptime->tm_year)<<endl; 28 cout<<"days since Sunday:"<<(ptime->tm_wday)<<endl; 29 cout<<"days since January 1:"<<(ptime->tm_yday)<<endl; 30 cout<<"daylight savings time flag:"<<(ptime->tm_isdst)<<endl; 31 }