59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
/*
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* 字符串工具接口实现
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*/
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#include"StringUtils.h"
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string doubleToString(double num) {
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char* buf;//double数据转换为无符号整数字符串 如12.34 -> 1234
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int dec, sign;//dec->小数点前有几位数字 sign->0为正数，1为负数
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buf = _fcvt(num, 2, &dec, &sign);
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string str;
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if (sign) str += "-";
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int i;
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for (i = 0; i < dec; i++) {
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str += buf[i];
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}
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if (dec == 0)
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str += "0";
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if (strcmp(buf, "00") != 0) {
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str += ".";
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for (; i < strlen(buf); i++) {
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str += buf[i];
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}
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}
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return str;
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}
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std::string trim(const std::string& str) {
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const std::string& whitespace = " \t";
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const auto strBegin = str.find_first_not_of(whitespace);
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if (strBegin == std::string::npos)
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return ""; // no content
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const auto strEnd = str.find_last_not_of(whitespace);
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const auto strRange = strEnd - strBegin + 1;
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return str.substr(strBegin, strRange);
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}
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std::string reduce(const std::string& str) {
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const std::string& fill = " ";
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const std::string& whitespace = " \t";
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// trim first
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auto result = trim(str);
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// replace sub ranges
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auto beginSpace = result.find_first_of(whitespace);
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while (beginSpace != std::string::npos)
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{
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const auto endSpace = result.find_first_not_of(whitespace, beginSpace);
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const auto range = endSpace - beginSpace;
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result.replace(beginSpace, range, fill);
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const auto newStart = beginSpace + fill.length();
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beginSpace = result.find_first_of(whitespace, newStart);
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}
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return result;
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} |