# NUMBER SYSTEMS. 1.1 Introduction

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1 NUMBER SYSTEMS 1.1 Introduction There are several number systems which we normally use, such as decimal, binary, octal, hexadecimal, etc. Amongst them we are most familiar with the decimal number system. These systems are classified according to the values of the base of the number system. The number system having the value of the base as 10 is called a decimal number system, whereas that with a base of 2 is called a binary number system. Likewise, the number systems having base 8 and 16 are called octal and hexadecimal number systems respectively. With a decimal system we have 10 different digits, which are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. But a binary system has only 2 different digits: 0 and 1. Hence, a binary number cannot have any digit other than 0 or 1. So to deal with a binary number system is quite easier than a decimal system. Now, in a digital world, we can think in binary nature, e.g., a light can be either off or on. There is no state in between these two. So we generally use the binary system when we deal with the digital world. Here comes the utility of a binary system. We can express everything in the world with the help of only two digits i.e., 0 and 1. For example, if we want to express 2510 in binary we may write The right most digit in a number system is called the Least Significant Bit (LSB) or Least Significant Digit (LSD). And the left most digit in a number system is called the Most Significant Bit (MSB) or Most Significant Digit (MSD). Now normally when we deal with different number systems we specify the base as the subscript to make it clear which number system is being used. In an octal number system there are 8 digits 0, 1, 2, 3, 4, 5, 6, and 7. Hence, any octal number cannot have any digit greater than 7. Similarly, a hexadecimal number system has 16 digits 0 to 9 and the rest of the six digits are specified by letter symbols as A,B, C, D, E, and F. Here A, B, C, D, E, and F represent decimal 10, 11, 12, 13, 14, and 15 respectively. Octal and hexadecimal codes are useful to write assembly level language. In general, we can express any number in any base or radix X. Any number with base X, having n digits to the left and m digits to the right of the decimal point, can be expressed as: where an is the digit in the nth position. The coefficient an is termed as the MSD or Most Significant Digit and bm is termed as the LSD or the Least Significant Digit. 1

2 1.2 CONVERSION BETWEEN NUMBER SYSTEMS It is often required to convert a number in a particular number system to any other number system, e.g., it may be required to convert a decimal number to binary or octal or hexadecimal. The reverse is also true, i.e., a binary number may be converted into decimal and so on Decimal-to-binary Conversion Now to convert a number in decimal to a number in binary we have to divide the decimal number by 2 repeatedly, until the quotient of zero is obtained. This method of repeated division by 2 is called the double-dabble method. The remainders are noted down for each of the division steps. Then the column of the remainder is read in reverse order i.e., from bottom to top order. We try to show the method with an example shown in Example 1.1. Example 1.1. Convert (26) 10 into a binary number. Solution: Hence the converted binary number is (11010) Decimal-to-octal Conversion Similarly, to convert a number in decimal to a number in octal we have to divide the decimal number by 8 repeatedly, until the quotient of zero is obtained. This method of repeated division by 8 is called octal-dabble. The remainders are noted down for each of the division steps. Then the column of the remainder is read from bottom to top order, just as in the case of the double-dabble method. We try to illustrate the method with an example shown in Example

3 Example 1.2. Convert (426) 10 into an octal number. Solution: Hence the converted octal number is (652) Decimal-to-hexadecimal Conversion The same steps are repeated to convert a number in decimal to a number in hexadecimal. Only here we have to divide the decimal number by 16 repeatedly, until the quotient of zero is obtained. This method of repeated division by 16 is called hexdabble. The remainders are noted down for each of the division steps. Then the column of the remainder is read from bottom to top order as in the two previous cases. We try to discuss the method with an example shown in Example 1.3. Example 1.3. Convert (348) 10 into a hexadecimal number. Solution: Hence the converted hexadecimal number is (15C) Binary-to-decimal Conversion Now we discuss the reverse method, i.e., the method of conversion of binary, octal, or hexadecimal numbers to decimal numbers. Now we have to keep in mind that each of the binary, octal, or hexadecimal number system is a positional number system, i.e., each of the digits in the number systems discussed above has a positional weight as in the case of the decimal system. We illustrate the process with the help of examples. 3

4 Example 1.4. Convert (10110) 2 into a decimal number. Solution. The binary number given is Positional weights Hence the decimal equivalent number is given as: = = (22) 10. Hence we find that here, for the sake of conversion, we have to multiply each bit with its positional weights depending on the base of the number system Octal-to-decimal Conversion Example 1.5. Convert into a decimal number. Solution. The octal number given is Positional weights Hence the decimal equivalent number is given as: = = (1842) Hexadecimal-to-decimal Conversion Example 1.6. Convert 42AD 16 into a decimal number. Solution. The hexadecimal number given is 4 2 A D Positional weights Hence the decimal equivalent number is given as: = = (17069) Fractional Conversion So far we have dealt with the conversion of integer numbers only. Now if the number contains the fractional part we have to deal in a different way when converting the number from a different number system (i.e., binary, octal, or hexadecimal) to a decimal number system or vice versa. We illustrate this with examples. Example 1.7. Convert into a decimal number. Solution. The binary number given is Positional weights

5 Hence the decimal equivalent number is given as: = = (10.375) 10. Example 1.8. Convert into a decimal number. Solution. The octal number given is Positional weights Hence the decimal equivalent number is given as: = = ( ) 10. Example 1.9. Convert 42A into a decimal number. Solution. The hexadecimal number given is 4 2 A. 1 2 Positional weights Hence the decimal equivalent number is given as: = = ( ) 10. Example Convert into a binary number. Therefore, (25) 10 = (11001) 2. Fractional Part: 5

6 i.e., (0.625) 10 = (0.101) 2 Therefore, (25.625) 10 = ( ) Conversion from a Binary to Octal Number and Vice Versa We know that the maximum digit in an octal number system is 7, which can be represented as in a binary system. Hence, starting from the LSB, we group three digits at a time and replace them by the decimal equivalent of those groups and we get the final octal number. Example Convert into an equivalent octal number. Solution. The binary number given is Starting with LSB and grouping 3 bits Octal equivalent Hence the octal equivalent number is (552) 8. Example Convert into an equivalent octal number. Solution. The binary number given is Starting with LSB and grouping 3 bits Octal equivalent Hence the octal equivalent number is (136) 8. Since at the time of grouping the three digits in Example 1.14 starting from the LSB, we find that the third group cannot be completed, since only one 1 is left out in the third group, so we complete the group by adding two 0s in the MSB side. This is called left padding of the number with 0. Now if the number has a fractional part then there will be two different classes of groups one for the integer part starting from the left of the decimal point and proceeding toward the left and the second one starting from the right of the decimal point and proceeding toward the right. If, for the second class, any 1 is left out, we complete the group by adding two 0s on the right side. This is called right-padding. Example Convert into an equivalent octal number. Solution. The binary number given is Grouping 3 bits Octal equivalent: Hence the octal number is (15.34) 8. Now if the octal number is given and you're asked to convert it into its binary equivalent, then each octal digit is converted into a 3-bit-equivalent binary number and combining all those digits we get the final binary equivalent. Example Convert into an equivalent binary number. Solution. The octal number given is bit binary equivalent Hence the binary number is ( ) 2. 6

9 Hence the octal equivalent of (4.BF85) 16 is ( ) 8. Example Convert (247) 8 into an equivalent hexadecimal number. Solution. Given octal number is Binary equivalent is = Forming groups of 4 bits from the LSB Hexadecimal equivalent A 7 Hence the hexadecimal equivalent of (247) 8 is (A7) 16. Example Convert (36.532) 8 into an equivalent hexadecimal number. Solution. Given octal number is Binary equivalent is = Forming groups of 4 bits Hexadecimal equivalent 1 E. A D Hence the hexadecimal equivalent of (36.532) 8 is (1E.AD) Binary Arithmetic Binary Addition The four basic rules for adding binary digits (bits) are as follows: 0+0=0 Sum of 0 with a carry 0 0+1=1 Sum of 1 with a carry 0 1+0=1 Sum of 1 with a carry 0 1+1=1 0 Sum of 0 with a carry 1 Examples: Binary Subtraction The four basic rules for subtracting are as follows: 0-0=0 1-1=0 1-0=1 0-1=1 0-1 with a borrow of 1 9

10 Examples: 's And 2's Complement of Binary Number The 1's complement and the 2's complement of binary number are important because they permit the representation of negative numbers. Binary Number 'sComplement 's Complement of a binary number is found by adding 1 to the LSB of the 1's Complement. 2's Complement= (1's Complement) +1 Binary number 'scomplement Add 's complement

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