Question

How to read and write a float to a binary file in C++

Answer 1

#include <iostream>
#include <fstream>

int main ()
{
    const char *FILENAME = "data.bin";
    float f = 3.14159;
    std::ofstream o(FILENAME, std::ios::binary);
 
    o.write((char*)&f, sizeof(f));
    o.close();
 
    float tmp = 0.0;
    std::ifstream i(FILENAME, std::ios::binary);
    i.read((char*)&tmp, sizeof(tmp));
    i.close();
     
    std::cout << tmp;
}
 
 
 
/*
run:
 
3.14159
 
*/

 

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