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cout保留两位小数输出 - C/C++ - 清泛网 - 专注C/C++及内核技术
...in() {
double dval = 123.456789;
// C风格
printf("in C: %.2f\n", dval);
// cout固定输出几位（整数+小数一起）
std::cout << std::setprecision(5) << dval << std::endl;
// cout固定输出2位小数，整数部分完整保留
std::cout << std::fixed <...
MAC地址可以连上，硬件通信时提示无效的UUID？ - 创客硬件开发 - 清泛IT社...
...。
[/hide]
经测试，我们的硬件mac地址是：
E2:E0:5A:46:86:2F
使用MAC地址连接，一切功能正常。
这个 APP程序 使用透传UUID 还可以控制蓝牙模块的IO 口么？这个 APP程序 使用透传UUID 还可以控制蓝牙模块的IO 口么？透传uuid和io...
D Programming Language in the real world? [closed]
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Is “inline” without “static” or “extern” ever useful in C99?
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);
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Reference: Comparing PHP's print and echo
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What GRANT USAGE ON SCHEMA exactly do?
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How exactly do Django content types work?
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Possibility of duplicate Mongo ObjectId's being generated in two different collections?
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OAuth 2.0: Benefits and use cases — why?
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What is the purpose of “android.intent.category.DEFAULT”?
...ll tutorials were written this way. Why do we still use wooden language in 2018?
– SudoPlz
Jan 4 '18 at 14:27
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