Write a program that will print two closest pair integers in an array (if there are more than one pair with the same distance, then print all pairs).

```
//Example:
6 -3 8 0 5
//The closest numbers:
5 6 -> difference is 1
```

In the following program I am using bubble sort algorithm, but don't know how to find the difference for each pair:

```
#include <stdio.h>
#include <stdlib.h>
void bubbleSort(int *arr, int n)
{
int i,j;
int min=0;
for(i=0;i<n-1;i++)
{
for(j=0;j<n-i-1;j++)
{
if(arr[j] > arr[j+1])
{
int temp=arr[j];
arr[j]=arr[j+1];
arr[j+1]=temp;
}
//for each "arr[j]","arr[j+1]"-> check "min"
}
}
}
int main()
{
int i,n;
int *arr;
do
{
printf("n=");
scanf("%d", &n);
}
while (n < 1);
arr = (int *)malloc(n * sizeof(int));
for (i = 0; i < n; i++)
{
printf("%d. number: ", i + 1);
scanf("%d",&arr[i]);
}
bubbleSort(arr, n);
for(i=0;i<n;i++)
printf("\n%d",arr[i]);
free(arr);
return 0;
}
```