Let’s see how to write a heap Sort program in C Language.
Here is the example snippet for you, try to understand the logic by going line by line:
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#include <stdio.h> void create(int []); void down_adjust(int [],int); void main() { int heap[30],n,i,last,temp; printf("Enter no. of elements:"); scanf("%d",&n); printf("\nEnter elements:"); for(i=1;i<=n;i++) scanf("%d",&heap[i]); //create a heap heap[0]=n; create(heap); //sorting while(heap[0] > 1) { //swap heap[1] and heap[last] last=heap[0]; temp=heap[1]; heap[1]=heap[last]; heap[last]=temp; heap[0]--; down_adjust(heap,1); } //print sorted data printf("\nArray after sorting:\n"); for(i=1;i<=n;i++) printf("%d ",heap[i]); } void create(int heap[]) { int i,n; n=heap[0]; //no. of elements for(i=n/2;i>=1;i--) down_adjust(heap,i); } void down_adjust(int heap[],int i) { int j,temp,n,flag=1; n=heap[0]; while(2*i<=n && flag==1) { j=2*i; //j points to left child if(j+1<=n && heap[j+1] > heap[j]) j=j+1; if(heap[i] > heap[j]) flag=0; else { temp=heap[i]; heap[i]=heap[j]; heap[j]=temp; i=j; } } } |
I hope this example C program helps you to understand heap sorting in C language.
