9’s complement of a decimal number is the subtraction of it’s each digits from 9. Like 1’s complement, 9’s complement is used to subtract a number using addition.
For example, let us compute value of “718 – 123” using 9’s complement and addition. We first find 9’s complement of 718 which is 281. Now we add 281 to 123. We get 404. 9’s complement of this is 595 which is equal to “718 – 123”. So we could find subtraction using addition and 9’s complement.
Given a decimal number n, find 9’s complement of the number.
Input : 25 Output : 9's complement is : 74 Input : 345.45 Output : 9's complement is : 654.54
Let the number be stored as string. We traverse digits of number and subtract every digit from 9.
9's complement is : 654.54
This article is contributed by Dibyendu Roy Chaudhuri. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
- 10's Complement of a decimal number
- Complement of a number with any base b
- 1's and 2's complement of a Binary Number
- Previous number same as 1's complement
- 8085 program to find 1's and 2's complement of 8-bit number
- 8085 program to find 1’s and 2’s complement of 16-bit number
- Interface 8255 with 8085 microprocessor for 1’s and 2’s complement of a number
- Check if binary representation of a given number and its complement are anagram
- What’s difference between 1's Complement and 2's Complement?
- Count number of digits after decimal on dividing a number
- Exponential notation of a decimal number
- Check if Decimal representation of an Octal number is divisible by 7
- Number of decimal numbers of length k, that are strict monotone
- Number of digits before the decimal point in the division of two numbers
- Converting Decimal Number lying between 1 to 3999 to Roman Numerals