【c++】string字符串拼接的三种方式

#include<iostream>#include<cstring>#include<sstream>using namespace std;string a = "hello ";string b = "world!";string f1(){return a + b;}string f2(){string c;c.append...

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10323人浏览 · 2020-03-11 18:50:42

TANTA(╯‵□′)╯︵┻━┻ · 2020-03-11 18:50:42 发布

#include<iostream>
#include<cstring>
#include<sstream>
using namespace std; 
string a = "hello ";
string b = "world!";
string f1(){
 return a + b;
}
string f2(){
 string c;
 c.append(a + b);
 /*or 
 c.append(a);
 c.append(b);
 */
 return c;
} 
string f3(){
 stringstream ss;
 ss<<a<<b;
 return ss.str();
}
int main(){
 //+
 cout << f1() <<endl;
 //append
 cout << f2() << endl;
 //sstream
 cout << f3() << endl;
 return 0;
}