用下面的方法：
用Borland C++Builder 6.0 新建一个控制台程序，
编写的Unit1.cpp的代码如下：

#include <vcl.h>
#include <iostream.h>
#include <conio.h>
#include <iomanip.h>
#pragma hdrstop
//-------------------------------------------------------------------
#pragma argsused

int main()
{
    int a = 1, b = 2, c = 3, g = 12345;
    long int h = 123456;
    float d = 7.2, e = -5.5, f = 1.56;
    char i = 'o', j = 'p';
    float sum1 = d + e, sum2 = f + e, sum3 = d + f;

    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
    cout << "c = " << c << endl;
    cout << "d = " << setiosflags(ios::fixed) << setprecision(6) << d << endl;
    cout << "e = " << e << endl;
    cout << "f = " << f << endl;
    cout << "d + e = " << setprecision(2) << sum1 << endl;
    cout << "e + f = " << sum2 << endl;
    cout << "d + f = " << setprecision(3) << sum3 << endl;
    cout << "g = " << setw(7) << g << endl;
    cout << "h = " << h << endl;
    cout << "i = " << i << endl;
    cout << "j = " << j << endl;

    getch();  //防止应用程序运行时MS-DOS窗口一闪而过

    return 0;
}
编译后按F9键运行。