Can someone explain me output of the code?

Question

#include <stdio.h>
int main()
{
char s[12]="SOLOLEARN";
int i = 1;
char ch1 = ++i[s];
char ch2 = i++[s];
printf("%c",ch1);
printf("\t%c",ch2);
return 0;
}

// Output :- P P

Answer 1

Line ch1:
Is implicitly ++(i[s])
i[s] is the char 1 of s (the first O)
As pre-incr. is used, this char is at first incremented (to P) and then stored into ch1 (ch1=='P')
Note: s is now "SPLOLEARN"

Line ch2:
Is implicitly (i++)[s]
As post-incr. is used, i[s] is stored into ch2 (ch2=='P')
Afterwards i is incremented.

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