[C++]将float保留2位小数并转成std::string

#include <iostream>
 #include <sstream>
 #include <iomanip>std::string float2string(float value) {
     std::ostringstream streamObj;
     // Set Fixed -Point Notation
     streamObj << std::fixed;
     // Set precision to 2 digits
     streamObj << std::setprecision(2);
     //Add double to stream
     streamObj << value;
     // Get string from output string stream
     return streamObj.str();
 }int main() {
     float value = 3.14159;
     std::string valueAsString = float2string(value);
     std::cout << valueAsString << std::endl; // Prints "3.14"
     return 0;
 }