iomanip.cpp

一本很好的C++学习的丛书！初学者必看的

// iomanip.cpp -- using manipulators from iomanip
// some systems require explicitly linking the math library
#include <iostream>
#include <iomanip>
#include <cmath>

int main()
{
    using namespace std;
    // use new standard manipulators
    cout << showpoint << fixed << right;

    // use iomanip manipulators
    cout << setw(6) << "N" << setw(14) << "square root"
         << setw(15) << "fourth root\n";

    double root;
    for (int n = 10; n <=100; n += 10)
    {
        root = sqrt(double(n));
        cout << setw(6) << setfill('.') << n << setfill(' ')
               << setw(12) << setprecision(3) << root
               << setw(14) << setprecision(4) << sqrt(root)
               << endl;
   }

    return 0; 
}