c语言浮点数的格式化输出,解析C++ 浮点数的格式化输出

C++格式化输出浮点数

#include

using std::cout;

using std::endl;

using std::fixed;

using std::scientific;

int main()

{

double x = 0.001234567;

double y = 1.946e9;

cout << "Displayed in default format:" << endl << x << '/t' << y << endl;

cout << "/nDisplayed in scientific format:" << endl << scientific << x << '/t' << y << endl;

cout << "/nDisplayed in fixed format:" << endl << fixed << x << '/t' << y << endl;

return 0;

}

Displayed in default format:

0.00123457      1.946e+009

Displayed in scientific format:

1.234567e-003   1.946000e+009

Displayed in fixed format:

0.001235        19460000