例子:
string s, ss; .
s = "The rain in Spain falls mainly in the plain."; ss = s.substr(12, 5); //Spain s.substr(12) // Spain falls mainly in the plain.例子:
string s, ss; .
s = "The rain in Spain falls mainly in the plain."; ss = s.substr(12, 5); //Spain s.substr(12) // Spain falls mainly in the plain.