Radix Sort Program In C

Radix Sort Program In C How To Best Implement Radix Sort Program In C? 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Goto Statement In C++ How To Implement Getline In C++? How To Implement Goto Statement In C++? How To Implement Sort function In C++? How To Implement Virtual Function in C++? How To Implement Inline Function in C++? How To Best Implement Type Conversion In C++? How To Best Implement Radix Sort Program In C? Published on Sep 10,2019 4.7K Views edureka Bookmark This article will introduce you Radix Sort and tell you how to implement Radix Sort program in C. Following pointers will be covered in this article,Radix Sort AlgorithmRadix Sort functionCount Sort FunctionSo let us get started then,In simple words, sorting means arranging the given elements in a systematic order. Sorting is done in most of the algorithms because it makes search easier which eventually makes the algorithm efficient. In this blog we will understand one of the commonly used soring algorithms i.e. Radix sort.Radix sort is a non-comparative integer sorting algorithm. It does digit by digit sorting starting from least significant digit(i.e. digit present at the right) to most significant digit(i.e. digit present at the left). Radix sort uses counting sort as a subroutine to sort. The lower bound for Comparison based sorting algorithm (such as Heap sort, Quick Sort, Merge Sort) is (nLogn), they it cant be improved beyond nLogn. If we talk about counting sort, it is a linear time sorting algorithm with O(n+k) time complexity, where the range lies between 1 to k. Now, the problem with counting sort is, it takes O(n2) when the elements range from 1 to n2.So, to sort an array with elements that range from 1 to n2 in linear time, we need radix sort. Radix sort sorts the array digit by digit starting from least significant digit to most significant digit. Radix sort uses counting sort as a subroutine to sort.Moving on with this article on Radix Sort Program In C,Radix Sort AlgorithmPerform the following steps for all the dig its starting from the least significant digit present in right, moving towards most significant digit present in left.Sort the elements using counting sort according to the current digit. Example:Original Array: 140, 65, 85, 110, 612, 54, 12, 86Sorting the least significant digit i.e. at ones place, gives140, 110, 612, 12, 54, 65, 85, 86NOTE: As 612 appears before 12, and the sorting is done only for ones digit, thus 612 appears before 12 after this iteration.Sorting by next digit, i.e. at 10s place, gives:110, 612, 12, 140, 54, 65, 85, 86Sorting by most significant digit, i.e. present at the 100s place, gives:012, 054, 065, 085, 086, 110, 140, 612Moving on with this article on Radix Sort Program In C,Radix Sort Program In CFirst look at Radix sort functionRadix Sort function: void radixsort(int array[], int n) { //Get the largest number to know the maximum number of digits int m = getMax(array, n); int dig; //Counting sort is performed for every digit for (dig = 1; m / dig 0; dig *= 10) countSort(array, n, dig); } Moving on with this article on Radix Sort Program In C,Count Sort Function: void countSort(int array[], int n, int dig) { int output[n]; int i, count[10] = { 0 }; // Store count of occurrences in count[] for (i = 0; i n; i++) count[(array[i] / dig) % 10]++; // Change count[i] so that count[i] now contains actual // position of this digit in output[] for (i = 1; i 10; i++) count[i] += count[i - 1]; // Build the output array for (i = n - 1; i = 0; i--) { output[count[(array[i] / dig) % 10] - 1] = array[i]; count[(array[i] / dig) % 10]--; } // Copy the output array to arr[], so that arr[] now // contains sorted numbers according to current digit for (i = 0; i n; i++) array[i] = output[i]; } Advancing ahead, lets write a C program to implement Radix sort.Example: #includestdio.h //Function to find the Largest Number int getMax(int array[], int n) { int max = array[0]; int i; for (i = 1; i n; i++) if (array[i] max) max = array[i]; return max; } //Function for Count sort void countSort(int array[], int n, int dig) { int output[n]; int i, count[10] = { 0 }; // Store count of occurrences in count[] for (i = 0; i n; i++) count[(array[i] / dig) % 10]++; // Change count[i] so that count[i] now contains actual // position of this digit in output[] for (i = 1; i 10; i++) count[i] += count[i - 1]; // Build the output array for (i = n - 1; i = 0; i--) { output[count[(array[i] / dig) % 10] - 1] = array[i]; count[(array[i] / dig) % 10]--; } // Copy the output array to arr[], so that arr[] now // contains sorted numbers according to current digit for (i = 0; i n; i++) array[i] = output[i]; } // The main function to that sorts arr[] of size n using Radix Sort void radixsort(int array[], int n) { //Get the largest number to know the maximum number of digits int m = getMax(array, n); int dig; //Counting sort is performed for every digit for (dig = 1; m / dig 0; dig *= 10) countSort(array, n, dig); } //Function to Print Array void print(int arr[], int n) { int i; for (i = 0; i n; i++) printf(%d , arr[i]); } int main() { int arr[] = { 140, 65, 85, 110, 612, 54, 12, 86 }; int n = sizeof(arr) / sizeof(arr[0]); radixsort(arr, n); print(arr, n); return 0; } OutputNow after executing the above program you would have understood the Radix Sort Program In C. Thus we have come to an end of this article on Quicksort in Java. If you wish to learn more, check out the Java Training by Edureka, a trusted online learning company. Edurekas Java J2EE and SOA training and certification course is designed to train you for both core and advanced Java concepts along with various Java frameworks like Hibernate Spring.Got a question for us? Please mention it in the comments section of this blog and we will get back to you as soon as possible.Recommended blogs for you Google Acquires Looker, Salesforce Acquires Tableau | What Does this Mean for Techies? 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