C question

Question

The correct push function is

a)S->arr[S->top++]=data

b)S->arr[++S->top]=data

c)S->arr[++(S->top)]=data

d)none of the above

Plz can anyone explain and also help me understand how stack is implemented using structure here

Comments

initially top of the stack =-1.

so first increment top variable then stroe the data .

in option C,it is correct.

in option B it increments the address of stack not top value because (++ is unary operator it is more precedence than ->)