1.進制
cout << _T(" 17.3 修改顯示時使用的計數系統") << endl;
int n;
n = 255;
dec(cout); // cout << dec;
cout << "dec : " << n << endl;
oct(cout); // cout << oct;
cout << "oct : " << n << endl;
hex(cout); // cout << hex ;
cout << "hex : " << n << endl;
dec(cout); // 不要影響其它人
int w = cout.width(30);
cout << "default field width = " << w << ":" << endl;
cout.width(5);
cout << "N" << ": ";
cout.width(8);
cout << "N * N" << ":" << endl;
for(long i=1; i<=100; i*=10)
{
cout.width(5);
cout << i << ": ";
cout.width(8);
cout << i * i << ":" << endl;
}
cout.width();
3. 填充字符
cout.fill('*');
int w = cout.width(30);
cout.width(5);
cout << "N" << ": ";
cout.width(8);
cout << "N * N" << ":" << endl;
for(long i=1; i<=100; i*=10)
{
cout.width(5);
cout << i << ": ";
cout.width(8);
cout << i * i << ":" << endl;
}
cout.width();
cout << endl << endl;
4. 浮點數顯示精度
float f1 = 23.3232;
float f2 = 1.9 + 8.0 / 9.0;
cout << "f1 = " << f1 << endl;
cout << "f2 = " << f2 << endl;
// 設置精度爲2
cout.precision(2);
cout << "f1 = " << f1 << endl;
cout << "f2 = " << f2 << endl;
// 解除設定
cout.precision();
5. setf用法
float f1 = 23.3232;
float f2 = 1.9 + 8.0 / 9.0;
cout << "f1 = " << f1 << endl;
cout << "f2 = " << f2 << endl;
// 設置精度爲2打印末位的0和小數點
cout.setf(ios_base::showpoint);
cout << "f1 = " << f1 << endl;
cout << "f2 = " << f2 << endl;
// 解除設定
cout.setf(ios_base::unitbuf);
6. setf高級用法
cout.setf(ios_base::showpos);
cout << 63 << endl;
cout.setf(ios_base::uppercase);
cout << "A string" << endl;
cout.setf(ios_base::showbase);
cout << 437 << endl;
cout.setf(ios_base::boolalpha);
cout << true << endl;
cout << false << endl;