#include#include using namespace std;int main(int argc, char* argv[]){ string name("rockderia"); string firstname(name.substr(0,4)); cout << firstname << endl; system("pause");}
output：rock
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#include#include using namespace std;int main(int argc, char* argv[]){ string name("rockderia"); string firstname(name.substr(0,4)); cout << firstname << endl; system("pause");}
output：rock
转载于:https://www.cnblogs.com/Never-Land/p/9743574.html