Radix Sort
Radix sort is a sorting algorithm that sorts in a similar way as the letters in the English alphabet are sorted, in the case of integers, radix sort sorts the numbers according to the digits.
Algorithm:

C program
#include <stdio.h>
int largest(int a[]);
void radix_sort(int a[]);
void main()
{
int i;
int a[10]={90,23,101,45,65,23,67,89,34,23};
radix_sort(a);
printf("\n The sorted array is: \n");
for(i=0;i<10;i++)
printf(" %d\t", a[i]);
}
int largest(int a[])
{
int larger=a[0], i;
for(i=1;i<10;i++)
{
if(a[i]>larger)
larger = a[i];
}
return larger;
}
void radix_sort(int a[])
{
int bucket[10][10], bucket_count[10];
int i, j, k, remainder, NOP=0, divisor=1, larger, pass;
larger = largest(a);
while(larger>0)
{
NOP++;
larger/=10;
}
for(pass=0;pass<NOP;pass++) // Initialize the buckets
{
for(i=0;i<10;i++)
bucket_count[i]=0;
for(i=0;i<10;i++)
{
// sort the numbers according to the digit at passth place
remainder = (a[i]/divisor)%10;
bucket[remainder][bucket_count[remainder]] = a[i];
bucket_count[remainder] += 1;
}
// collect the numbers after PASS pass
i=0;
for(k=0;k<10;k++)
{
for(j=0;j<bucket_count[k];j++)
{
a[i] = bucket[k][j];
i++;
}
}
divisor *= 10;
}
} |
Reference