I tried to do bubble sort using c/c++. It shows the wrong output. I couldn't figure out where the bug is.
#include <stdio.h>
#define true 1
#define false 0
int main()
{
int arr[]={26,27,2,38,44,4,19};
int n= sizeof arr/sizeof(int);
int swapped;
int unsorted_index= n-1, temp;
do{
swapped=false;
for(int i=0; i< unsorted_index-1; i++)
if(arr[i]>arr[i+1])
{
temp=arr[i];
arr[i]=arr[i+1];
arr[i+1]=temp;
swapped=true;
}
unsorted_index--;
} while(swapped || unsorted_index);
for(int i=0; i<n; i++)
printf("%d ",arr[i]);
return 0;
}
it shows the output: 2 4 26 27 38 44 19
instead of: 2 4 19 26 27 38 44
The problem is your loop is not traversing the complete array. To do this:
Replace "unsorted_index= n-1" to "unsorted_index= n".
output:
2 4 19 26 27 38 44