긴 문자열을 여백 (setw())으로 올바르게 인쇄하는 방법은 무엇입니까?

Question

내 문자열은 흠, 350 자입니다. 왼쪽과 오른쪽에서 동일한 여백을 갖도록 콘솔에 센터를 배치해야합니다.

내가 이것에 setw()하려고하면, 나는이 같은 출력을 얻는다. (시작 부분에만 여백이있다.) 내가 달성하기 위해 노력하고있어

  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 

:

   aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 

내 코드는이 (좌측 만, 나는 심지어 두 번째 아직 시도하지 않았다)처럼 보이는

:

out << left << setw(20) << " " << longString << endl; 

누군가 내 목표를 달성하는 방법을 알고 있다면, 나는 감사 할 것입니다!

Answer 1

당신은 오히려 간단하다 선폭을 알고있는 경우 :

#include <iostream> 
#include <string> 
#include <iomanip> 

int main(){ 
    std::string longstring = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; 
    int margin = 5; 
    int linewidth = 10; 
    int pos = 0; 
    while (pos < longstring.size()){ 
     std::cout << std::setw(linewidth) 
        << longstring.substr(pos,linewidth-margin) << std::endl; 
     pos+= linewidth-margin; 
    } 
}