lab11_1.cpp

清华大学郑莉《C++语言程序设计》课件、C++教材源代码、实验参考程序全集

//lab11_1.cpp
#include <fstream>
using namespace std;
#define D(a) T << #a << endl; a
ofstream T("output.out");

int main() {
  D(int i = 53;)
  D(float f = 4700113.141593;)
  char* s = "Is there any more?";

  D(T.setf(ios::unitbuf);)

  D(T.setf(ios::showbase);)
  D(T.setf(ios::uppercase);)
  D(T.setf(ios::showpos);)
  D(T << i << endl;)
  D(T.setf(ios::hex, ios::basefield);)
  D(T << i << endl;)
  D(T.unsetf(ios::uppercase);)
  D(T.setf(ios::oct, ios::basefield);)
  D(T << i << endl;)
  D(T.unsetf(ios::showbase);)
  D(T.setf(ios::dec, ios::basefield);)
  D(T.setf(ios::left, ios::adjustfield);)
  D(T.fill('0');)
  D(T << "fill char: " << T.fill() << endl;)
  D(T.width(8);)
  T << i << endl;
  D(T.setf(ios::right, ios::adjustfield);)
  D(T.width(8);)
  T << i << endl;
  D(T.setf(ios::internal, ios::adjustfield);)
  D(T.width(8);)
  T << i << endl;
  D(T << i << endl;) // Without width(10)

  D(T.unsetf(ios::showpos);)
  D(T.setf(ios::showpoint);)
  D(T << "prec = " << T.precision() << endl;)
  D(T.setf(ios::scientific, ios::floatfield);)
  D(T << endl << f << endl;)
  D(T.setf(ios::fixed, ios::floatfield);)
  D(T << f << endl;)
  D(T.setf(0, ios::floatfield);) // Automatic
  D(T << f << endl;)
  D(T.precision(16);)
  D(T << "prec = " << T.precision() << endl;)
  D(T << endl << f << endl;)
  D(T.setf(ios::scientific, ios::floatfield);)
  D(T << endl << f << endl;)
  D(T.setf(ios::fixed, ios::floatfield);)
  D(T << f << endl;)
  D(T.setf(0, ios::floatfield);) // Automatic
  D(T << f << endl;)

  D(T.width(8);)
  T << s << endl;
  D(T.width(36);)
  T << s << endl;
  D(T.setf(ios::left, ios::adjustfield);)
  D(T.width(36);)
  T << s << endl;

  D(T.unsetf(ios::showpoint);)
  D(T.unsetf(ios::unitbuf);)
}