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std::uppercase

STD：：大写，std：：nouppercase

Defined in header ​​
std::ios_base& uppercase( std::ios_base& str (1)​
std::ios_base& nouppercase( std::ios_base& str (2)​

允许在浮点数和十六进制整数输出中使用大写字符.。对输入没有影响。

1%29启用uppercase溪流中的旗子str好像通过打电话str.setf(std::ios_base::uppercase)...

2%29禁用uppercase溪流中的旗子str好像通过打电话str.unsetf(std::ios_base::uppercase)...

这是一个I/O操作程序，可以用表达式调用它，如out << std::uppercase对任何out类型std::basic_ostream或使用表达式，如in >> std::uppercase对任何in类型std::basic_istream...

参数

str-reference to I/O stream

返回值

str%28操作后对流的引用%29。

例

二次

#include <iostream>
int main()
{
    std::cout << std::hex << std::showbase
              << "0x2a with uppercase: " << std::uppercase << 0x2a << '\n'
              << "0x2a with nouppercase: " << std::nouppercase << 0x2a << '\n'
              << "1e-10 with uppercase: " << std::uppercase << 1e-10 << '\n'
              << "1e-10 with nouppercase: " << std::nouppercase << 1e-10 << '\n';
}

二次

产出：

二次

0x2a with uppercase: 0X2A
0x2a with nouppercase: 0x2a
1e-10 with uppercase: 1E-10
1e-10 with nouppercase: 1e-10

二次

另见

resetiosflagsclears the specified ios_base flags (function)
setiosflagssets the specified ios_base flags (function)

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