C++数据格式化1 - uint转换成字符串 double转换成字符串

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1. 关键词
2. strfmt.h
3. strfmt.cpp
4. 测试代码
5. 运行结果
6. 源码地址

1. 关键词

C++ 数据格式化字符串处理 std::string int double 跨平台

2. strfmt.h

#pragma once#include <string>
#include <cstdint>
#include <sstream>
#include <iomanip>namespace cutl
{/*** @brief Format uint64 value to a string with a given width and fill character.** @param val the value to be formatted.* @param width the width of the formatted string.* @param fill the fill character of the formatted string, default is '0'.* @return std::string the formatted string.*/std::string fmt_uint(uint64_t val, uint8_t width = 0, char fill = '0');/*** @brief Format double value to a string with a given precision.** @param val the value to be formatted.* @param precision the precision of the formatted string, default is 2.* @return std::string the formatted string.*/std::string fmt_double(double val, int precision = 2);
} // namespace cutl

3. strfmt.cpp

#include <sstream>
#include <iomanip>
#include <bitset>
#include "strfmt.h"namespace cutl
{std::string fmt_uint(uint64_t val, uint8_t width, char fill){std::stringstream ss;ss << std::setfill(fill) << std::setw(width) << val;return ss.str();}std::string fmt_double(double val, int precision){std::stringstream ss;ss << std::setiosflags(std::ios::fixed) << std::setprecision(precision) << val;return ss.str();}
} // namespace cutl

4. 测试代码

#include "common.hpp"
#include "strfmt.h"void TestFormatUintAndDouble()
{PrintSubTitle("TestFormatUintAndDouble");std::cout << "fmt_uint 1: " << cutl::fmt_uint(12) << std::endl;std::cout << "fmt_uint 2: " << cutl::fmt_uint(12, 4) << std::endl;std::cout << "fmt_uint 3: " << cutl::fmt_uint(12, 4, 'x') << std::endl;std::cout << "fmt_double 1: " << cutl::fmt_double(3.141592653) << std::endl;std::cout << "fmt_double 2: " << cutl::fmt_double(3.141592653, 3) << std::endl;
}

5. 运行结果

--------------------------------------TestFormatUintAndDouble---------------------------------------
fmt_uint 1: 12
fmt_uint 2: 0012
fmt_uint 3: xx12
fmt_double 1: 3.14
fmt_double 2: 3.142