Pointers Doubt with operators

#1

int main()
{
char arr[] = “geeksforgeeks”;
char *ptr = arr;

while(*ptr != ‘\0’)
++*ptr++;
printf("%s %s", arr, ptr);

getchar();
return 0;
}
output:
hffltgpshfflt

i am not able to understand the output

#2

The ascii value of each charcter of the string is getting incremented by 1.
Initially ptr pointer holds the base address… (or it points to the first character)

++*ptr++;

This line means that increase the ascii value of the current character(where ptr points) by one…and then make the ptr pointer point to the next character.
So by this was final output comes as
hffltgpshfflt

#3

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