Why first it prints garbage value

Question

#include<stdio.h>
int main()
{
int arr[5], i=0;
while(i<5)
arr[i]=++i;
for(i=0; i<5; i++)
printf("%d, ", arr[i]); return 0;
}

Answer 1

Please make this a code and then post it, so we can execute it directly.