145 lines
3.4 KiB
C++
145 lines
3.4 KiB
C++
#include "Fixed.hpp"
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/*
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* functions to print numbers in binary
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* for the float, found help from stackoverflow :
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* https://stackoverflow.com/questions/474007/floating-point-to-binary-valuec
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*/
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std::string printBitsInt(int num)
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{
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int i = 0;
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for (unsigned int mask = 1U << (sizeof(int) *8 -1); mask; mask >>= 1)
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{
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std::cout << ((num & mask) != 0);
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i++;
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if (i == 1 || i == 9 || i == 24)
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std::cout << ' ';
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}
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return "";
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}
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std::string printBitsFloat(float num)
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{
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int *p = (int *)#
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int i = 0;
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for (unsigned int mask = 1U << (sizeof(float) *8 -1); mask; mask >>= 1)
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{
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std::cout << ((*p & mask) != 0);
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i++;
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if (i == 1 || i == 9 || i == 24)
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std::cout << ' ';
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}
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return "";
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}
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/*
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* statics variables initialisation
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*
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* for MAX integer :
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* 00000000 01111111 11111111 11111111 ( 8388607) (-1U >> (this->_frac +1))
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* <= ... >=
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* 11111111 10000000 00000000 00000000 (-8388608)
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*
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*/
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int const Fixed::_frac = 8;
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int const Fixed::_max = -1U >> (_frac +1);
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/*
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* default constructor / copy constructor / destructor
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*/
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Fixed::Fixed() : _value(0) {
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// std::cout << "Default constructor called" << '\n';
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return;
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}
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Fixed::Fixed(Fixed const & src) {
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// std::cout << "Copy constructor called" << '\n';
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*this = src;
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return;
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}
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Fixed::~Fixed( void ) {
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// std::cout << "Destructor called" << '\n';
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return;
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}
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/*
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* int and float constructors
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*/
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Fixed::Fixed(int integer) {
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// std::cout << "Int constructor called" << '\n';
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if (integer < ~this->_max || integer > this->_max)
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{
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std::cout << "error: integer out of range" << '\n';
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return;
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}
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// std::cout << "integer : " << printBitsInt(integer) << " (" << integer << ")\n";
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this->_value = integer << this->_frac;
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// std::cout << "_value : " << printBitsInt(this->_value) << " (" << this->_value << ")\n";
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}
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Fixed::Fixed(float const floater) {
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// std::cout << "Float constructor called" << '\n';
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if (floater < ~this->_max || floater > this->_max)
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{
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std::cout << "error: float out of range" << '\n';
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return;
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}
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// std::cout << "floater : " << printBitsFloat(floater) << " (" << floater << ")\n";
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this->_value = floater * (1 << this->_frac);
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// std::cout << "_value : " << printBitsInt(this->_value) << " (" << this->_value << ")\n";
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/*
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this->_value = *((int *)&floater); // cast float to int
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int sign = this->_value & (1 << 31); // extract sign
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int exponent = ((unsigned int)(this->_value << 1) >> 24) - 127; // extract exponent
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int integer = (this->_value << 8) | (1 << 31); // add left 1
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integer = (unsigned int)integer >> (31 - this->_frac - exponent);// align to right
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if (sign != 0)
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integer = (~integer + 1); // reverse negatif
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integer = (integer << (30 - this->_frac - exponent)) | sign; // add sign
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integer >>= (30 - this->_frac - exponent); // align right
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std::cout << "integer : " << printBitsInt(integer) << " (" << integer << ")\n";
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*/
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}
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/*
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* assignement operator
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*/
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Fixed & Fixed::operator=( Fixed const & rhs ) {
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// std::cout << "Copy assignment operator called" << '\n';
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if ( this != &rhs )
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this->_value = rhs.getRawBits();
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return *this;
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}
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/*
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* other functions
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*/
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int Fixed::getRawBits( void ) const {
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// std::cout << "getRawBits member function called" << '\n';
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return this->_value;
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}
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void Fixed::setRawBits( int const raw ) {
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this->_value = raw;
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}
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void Fixed::toFloat( void ) const {}
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int Fixed::toInt( void ) const {
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return 0;
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}
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