pStr++;   pointer arithmetic, pStr points to the 2nd character of the string

printf("%s\n", pStr );    therefore we print from the second character on

 

Answer:  bcd

 

(*pStr)++;    dereferencing pStr first, we get to the 2nd character of the string, which is the letter b. 

                                 Incrementing the b character gives us the c character

printf("%s\n", str );   therefore we print the modified string

 

Answer:  accd