How do you convert a floating decimal to binary in C plus plus?

Answer 1

#include<iostream>

#include<string>

#include<limits>

#include<iomanip>

std::string char2bin( char c )

{

std::string result( 8, '0');

int bit = 8;

while( bit-- )

{

result[bit] += (c & 0x01);

c >>= 1;

}

return( result );

}

template<typename T>

std::string tobin( T t )

{

std::string result;

const size_t size = sizeof( T );

char* p = (char*) &t + size - 1;

unsigned int s = size;

while( s-- )

result += char2bin( *p-- );

return( result );

}

int main()

{

double d = 1.2345;

float f = 1.2345;

std::cout<<std::setprecision(std::numeric_limits<float>::digits10+1)<<d<<" (float) in binary is "<<tobin(f).c_str()<<std::endl;

std::cout<<std::setprecision(std::numeric_limits<double>::digits10+1)<<d<<" (double) in binary is "<<tobin(d).c_str()<<std::endl;

}