# 2010/9/19. Binary number system. Binary numbers. Outline. Binary to decimal

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1 2/9/9 Binary number system Computer (electronic) systems prefer binary numbers Binary number: represent a number in base-2 Binary numbers Some terminology Bit: a binary digit ( or ) Hexadecimal notation ( 十 六 進 位 ) Represents each 4 bits by a single symbol Example: A3 denotes 2 Outline Integer: decimal-binary conversion Integer addition Negative integer (2 s complement representation) Real numbers (floating point representation) Binary to decimal What is the decimal number of b?

2 2/9/9 Decimal to binary What is the binary number of 3 d? Step : Divide the value by 2 and record the remainder Step 2: If quotient is not zero, use the quotient as the new value and repeat step Step 3: The binary representation is the recorded remainders listed from right to left 6 Quotient = 6 Remainder = 3 Quotient = 3 Remainder = Quotient = Remainder = Quotient = Remainder = Algorithm A finite sequence of instructions to describe a systematical method to solve a problem We can represent the decimal-to-binary algorithm by a flow chart It has starting point [step ] Step 2 is a condition statement Step+step 2 is a loop statement The problem size is shrunk after each loop The loop can be terminated [when quotient ==] start n/2 Quotient ==? Yes Arrange the reminders to get the answer Homework: write an algorithm to convert binary to decimal No, let n=quotient 十 進 位 轉 二 進 位 演 算 法 Three algorithms Problem: converting n d to m b. Algorithm : as mentioned in the last class Algorithm 2: m b = For i = to n d m b = m b + Algorithm 3: m b = While n d is not Find 2 k n d <2 k+ m b = m b + 2 k n d = n d 2 k What is the cost of m b = m b +? start What is the cost of finding k? The cost of m b +2 k is just putting at the kth position of m b What is the cost of n d = n d 2 k? n/2 Quotient ==? Yes Arrange the reminders to get the answer No, let n=quotient Recursive algorithm The first algorithm is a recursive algorithm To answer what the binary of 3 d is, you need to answer what the binary of 6 d is. To answer what the binary of 6 d is, you need to answer what the binary of 3 d is. To answer what the binary of 3 d is, you need to answer what the binary of d is. Recursive algorithm Turn a big problem into one or several smaller subproblems Each subproblem is identical to the original one except size Thus, they can be solved by the same method. Need a termination condition. Binary(6) Binary(3) Binary() Binary(3) 2

3 2/9/9 Integer addition One bit addition What is 5 d +9 d using binary number representation? Another example + Binary number in computer systems Mathematically, a binary integer can have arbitrary number of bits. In computer systems, all data has a limited number of bits. For example, there are different sized (data type) integers char: 8 bits: [, 255] unsigned short: 6 bits: [, 65535] unsigned int: 32 bits: [, ] Overflow: when adding two integers, the result exceeds the numerical range of the data type Ex: (char) 23+(char) 234 = (char) How about negative integers? We use sign to distinguish positive and negative numbers. In computer system, we can use a bit to present the sign. In a 4 bit integer, for and for -. (sign bit) Good for notation, but difficult for calculation. One bit subtraction - - Example: = -*2+*=- 3

4 2/9/9 Negative integer Can we design a negative number representation such that 4-=4+(-) can be done easily (as easy as addition)? Hint: all number representation in computers has a finite number of bits. If we use 4 bits to represent an integer Zero is, and one is. What is -? Find b 3, b 2, b, b such that b 3 b 2 b b This will be truncated since it is a 4 bits integer Thus, we can use b to represent - d. + Two s complement This number representation is called the two s complement. Algorithm to find the 2 s complement of an integer Step : invert each bit, to and to Step 2: Add. b b ( 6) 6 d = b b -6 d = b b + b b = 6 d b + b b = 6 d truncated Textbook uses a different algorithm, which is used in circuit design + b ( 6) b ( ) Data type b can be d or -6 d. How to tell? Given a bit pattern, one need to specify its data type b is d for unsigned 4 bit int and -6 d for signed 4 bit int In C, there are data types for signed and unsigned integer Data type Number of bits Numerical range char 8 [,255] unsigned short 6 [,65525] short 6 [ 32768, ] unsigned int (long) 32 [, 4,294,967,295] int, long 32 [ 2,47,483,648, +2,47,483,647] unsigned long long 64 [, 2 64 ] long long 64 [ 2 63, 2 63 ] 2 s complement to decimal Give a 2 s complement representation, how to know it is a positive number or a negative number? Observe: The left most bit of all positive numbers is, and of all negative numbers is The left most bit of singed data type is called the sign bit Converting 2 s complement to decimal Step: check the sign bit to tell the sign Step 2: If it is a negative number, convert it to its 2 s complement Step 3: Convert the number to decimal and add the sign Step 2 and step 3 are like subroutines, which invoke other algorithms mentioned before. 4

5 2/9/9 2 s complement addition Examples Another type of overflow What is 5+4 in signed 4 bit representation? 5 d +4 d = b + b = b This is another type of overflow Adding two positive numbers results a negative number; or adding two negative numbers results a positive number. A 4 bits 2 s complement system can only represent 7~ 8 Fraction The binary number of fractions Fraction point To represent a wide range of numbers, we allow the decimal point to float. 4. d = 4. d = 4 d - =.4 d 2 It is just like the scientific notation of numbers.. b = +. b 2 2d = +. b 2 b. This is called the floating point representation of fractions. 5

6 2/9/9 Coding the value of 2 5 / 8 Sign Exponent 2 5 / 8 Binary representation. Normalization. 2 2 truncated Mantissa Exponent uses excess notation Signed number representations Comparison of 4 bit signed integer representation by sign-bit notation, 2 s complement, and excess notation Sign-bit notation 2 s complement Excess notation , Floating-point numbers In C (and most programming languages), there are two data types for real numbers Data type Size Structure Range Precision float 32 bits Sign: bit Exponent: 8 bits Mantissa: 23 bits double 64 bits Sign: bit Exponent: bits Mantissa: 52 bits ± ~ to ~ ~ 8 ± ~ to ~ 38.3 ~ 6 Truncation error Mantissa field is not large enough 2 5 / 8 = round off error (.25) Nonterminating representation. = / 6 + / 32 + / / Change the unit of measure Order of computation: = ( ) =2.75 More in 數 值 分 析 6

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