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modif readme binary conversions recuperation methode deplacement binaires, extrait fonctions printBits dans fichier a part

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Hugo LAMY
2022-02-15 15:20:55 +01:00
parent c9a833bc00
commit 3e92c847fa
6 changed files with 63 additions and 50 deletions
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20
d02/README.md
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@@ -245,7 +245,7 @@ REPRESENTATION FLOATS vs INTEGERS
---------------------------------------------------------
```
integer : 1 (1)
integer : 1 (1)
floater : 0 01111111 00000000000000000000000 (1)
integer : 1010 (10)
@@ -266,7 +266,7 @@ floater : 0 10000100 00010 100000000000000000 (34.5)
100010.100011001100110011 (34.55)
floater : 0 10000100 00010 100011001100110011 (34.55)
1.0001100110011001101 (1.1)
1.0001100110011001101 (1.1)
floater : 0 01111111 00011001100110011001101 (1.1)
100010.01 (34.25)
@@ -291,7 +291,7 @@ par multiplications binaires :
100010.01000000 34.25
* 1 00000000.00000000 * 256.00
----------------------- --------
100010 01000000.0 8768.00
100010 01000000 8768.00
34.25 * (1 << _frac)
```
@@ -301,10 +301,16 @@ par decalage binaire :
10000100 (132) decaler la virgule de 132 - 127 = 5
100010.01 (34.25) fixe
value = 34.25;
signe = (unsigned int)value;
exponent = ((unsigned int)(value << 1) >> 24) - 127;
fixedd = (unsigned int)(value << 9) >> (32 - exponent - 8);
this->_value = *((int *)&floater); // access float adress content as int
int sign = this->_value & (1 << 31); // extract sign
int exponent = ((unsigned int)(this->_value << 1) >> 24) - 127; // extract exponent
int integer = (this->_value << 8) | (1 << 31); // add left 1
integer = (unsigned int)integer >> (31 - this->_frac - exponent);// align to right
if (sign != 0)
integer = (~integer + 1); // reverse negatif
integer = (integer << (30 - this->_frac - exponent)) | sign; // add sign
integer >>= (30 - this->_frac - exponent); // align right
std::cout << "integer : " << printBitsInt(integer) << " (" << integer << ")\n";
```