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Radix Sort in C Language


Program to implement Radix Sort in C 

#include<stdio.h>
#include<conio.h>

typedef struct queue
{
   int front,rear;
   int item[10];
}q;

void enqueue(q* qp,int val)
{
   (qp)->rear++;
   (qp)->item[(qp)->rear]=val;
   return;
}
int dequeue(q* qp)
{
   int val;
   val=(qp)->item[(qp)->front];
   (qp)->front++;
   return val;
}
int empty(q* qp)
{
   if((qp)->rear<(qp)->front)
 return 1;
   return 0;
}
void radix(int*a,int m,int n)
{
   q qu[10];
   int i,j,r,d=1,k;
   for(i=1;i<=m;i++)
   {
 for(j=0;j<10;j++)
 {
qu[j].rear=-1;
qu[j].front=0;
 }
 for(j=0;j<n;j++)
 {
r=a[j]%(d*10);
r=r/d;
enqueue(&qu[r],a[j]);
 }
 d*=10;
 k=0;
 for(j=0;j<10;j++)
 {
 while(empty(&qu[j])==0)
a[k++]=dequeue(&qu[j]);
 }
   }
   return;
}
void main()
{
   int a[10],i,no,max=a[0],count=0;
   clrscr();
   printf("\n\n Enter no of elements..");
   scanf("%d",&no);
   printf("\n\n Enter the elements..");
   for(i=0;i<no;i++)
   {
 scanf("%d",&a[i]);
 if(a[i]>max)
max=a[i];
   }
   while(max>0)
   {
 max=max/10;
 count++;
   }
   radix(a,count,no);
   printf("\n\n The sorted elements are..");
   for(i=0;i<no;i++)
 printf("%d\t",a[i]);
   getch();
}

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