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Http://www.cnblogs.com/kingwolfofsky/archive/2011/07/21/2112299.html
floating point numbers
1. What are floating point numbers
In the process of computer system development, several methods have been proposed to express real numbers. Typically, for
Directory
Code Restoration Technology
I. Introduction code Restoration
Ii. Data Type representation in code Restoration
1. Integer type
2. unsigned integer
3. signed integer
4. Floating Point Data Type
5.
Storage Method of floating point and floating point in memory, floating point
First, let's talk about how to convert decimal places to binary decimal places. The computer doesn't even know the decimal data. He only knows 0 and 1. So, decimal decimal
1 representation of floating point numbers
Typically, we can use the following format to represent floating-point numbers
S
P
M
where S is the sign bit, p is the order, M is the mantissa
For IBM-PC, the
Floating point number:Floating-point variables occupy 4 bytes (byte) in computer memory, which is 32-bit. Follow the IEEE-754 format standard. A floating-point number consists of 2 parts: base m and exponent E.
±mantissax2exponent(Note that the
1 representation of floating-point numbersIn general, we can use the following format to represent floating-point numbers
S
P
M
where S is the sign bit, p is the order, M is the mantissaFor IBM-PC, a
How C + + + + floating-point numbers are stored in memoryAny data in memory is stored in binary form, such as a short data 1156, and a binary representation of 00000100 10000100. In the Intel CPU architecture of the system, the storage method is 1000
[CPP] View plain copy #include using namespace std; int main (int argc, char* argv[]) {Float A = 1.0f;//floating-point number in memory is a cout0011 1111 1000 0000 0000 0000 0000 0000
Symbol part: 0 (pink background);
Index part: 127+0=127 (yellow
First, let's look at a piece of code (in VC, in C ++ ):
int a = 2; int b = 3; int c = 6; if(1.0 / a + 1.0 / 3 + 1.0 / c >= 1.0) cout
Is yes output or no output?Answer:In the console, after several seconds, no is output.The problem arises.
Float variable takes 32bit, which is 4 bytes of memory spaceLet's first look at the three components of the floating point binary representation.The three main ingredients are:
Sign (1bit): Indicates whether the floating-point number is
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