整数と浮動小数点数を書式化して表示

明解Ｃ言語入門編 > 2. 演算と型 >

C++



#include <iostream.h>

#include <iomanip.h>
int main(int argc, char* argv[])

{
    cout << "["                                    << 123 << "]" <<endl;

    cout << "[" << setfill('0') << setw(4)         << 123 << "]" <<endl;

    cout << "[" << setfill(' ') << setw(4)         << 123 << "]" <<endl;

    cout << "[" << setfill(' ') << setw(4) << left << 123 << "]" <<endl;
    cout << "["                                    << 12345 << "]" <<endl;

    cout << "[" << setfill('0') << setw(3)         << 12345 << "]" <<endl;

    cout << "[" << setfill(' ') << setw(3)         << 12345 << "]" <<endl;

    cout << "[" << setfill(' ') << setw(3) << left << 12345 << "]" <<endl;
    cout << "["                                                         << 123.45 << "]" << endl;

    cout << "[" << setw(11)                 << setprecision(5) << right << 123.45 << "]" << endl;

    cout << "[" << setw(11)                 << setprecision(1)          << 123.45 << "]" << endl;

    cout << "[" << setw(11) << fixed        << setprecision(1)          << 123.45 << "]" << endl;

    cout << "[" << setw(11)                 << setprecision(5) << left  << 123.45 << "]" << endl;

    cout << "[" << setw(11) << setfill('0') << setprecision(5)          << 123.45 << "]" << endl;
    return 0;

}

実行結果



T:\>lesson015\Project1.exe

[123]

[0123]

[ 123]

[123 ]

[12345]

[12345]

[12345]

[12345]

[123.45]

[     123.45]

[      1e+02]

[      123.5]

[123.45000  ]

[123.4500000]