浮动添加提升到双倍？

float_number = 1.23
double_float_number = float_number * 2
print(double_float_number)

double floatNumber = 1.23;
double doubleFloatNumber = floatNumber * 2;
System.out.println(doubleFloatNumber);

#include<iostream>

int main() {
    double floatNumber = 1.23;
    double doubleFloatNumber = floatNumber * 2;
    std::cout<< doubleFloatNumber<< std::endl;
    return 0;
}