将String转换为c ++中的float

#include <iostream>
#include <string>
#include <cmath>

int main() {
    std::string str = "123.45";
    float num = std::stof(str);
    std::cout << "字符串转换为 float: " << num << std::endl;
    return 0;
}

字符串转换为 float: 123.45

#include <iostream>
#include <string>
#include <cmath>

int main() {
    std::string str = "123.45e6";
    float num = std::stod(str);
    std::cout << "字符串转换为 float: " << num << std::endl;
    return 0;
}

字符串转换为 float: 1234500000.0