Question

For C++

Write a program that randomly generates 100 integers and sorts them using radix sort.

Note: Your output would not be the same as this sample output due to the randomness.

Sample output:

0 0 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 3
3 3 3 4 4 4 4 4 4 4
4 5 5 5 6 6 6 6 6 6
7 7 7 7 7 7 8 8 8 8
8 9 9 9 9 9 9 10 10 10
10 11 11 11 11 11 11 12 12 13
13 13 13 13 13 14 14 14 15 15
15 15 16 16 16 16 16 17 17 17
18 18 18 18 18 18 18 19 19 19

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Answer 1

/* The below program generates 100 random numbers from 0 to 19 and then sort them using radix sort. Note that you can generate random numbers of any range by changing the rand%20 in main*/

#include<iostream>
#include<time.h>
using namespace std;

int maximum(int array[], int n)
{
   int mx = array[0];
   for (int i = 1; i < n; i++)
       if (array[i] > mx)
           mx = array[i];
   return mx;
}

void countSort(int array[], int n, int exp)
{
   int output[n];
   int i, count[10] = {0};

   for (i = 0; i < n; i++)
       count[ (array[i]/exp)%10 ]++;

   for (i = 1; i < 10; i++)
       count[i] += count[i - 1];

   for (i = n - 1; i >= 0; i--)
   {
       output[count[ (array[i]/exp)%10 ] - 1] = array[i];
       count[ (array[i]/exp)%10 ]--;
   }

   for (i = 0; i < n; i++)
       array[i] = output[i];
}

void radixsort(int array[], int n)
{
   int m = maximum(array, n);

   for (int exp = 1; m/exp > 0; exp *= 10)
       countSort(array, n, exp);
}

void print(int array[], int n)
{
   for (int i = 0; i < n; i++) {
   if(i%10==0&&i!=0)
       cout<<endl;
       cout << array[i] << " ";
      
   }
}
int main()
{ srand(time(0));
   int array[100];
   for(int i=0;i<100;i++)
   array[i]=rand()%20;
   int n = sizeof(array)/sizeof(array[0]);
   radixsort(array, n);
   print(array, n);
   return 0;
}