Question

c++中set -w操作符对应的头文件？？？

Answer 1

iomanip.h
是set(w)吧 设置输出宽度为w

Answer 2

// setw example
#include <iostream>
#include <iomanip>
using namespace std;

int main () {
cout << setw (10);
cout << 77 << endl;
return 0;
}