OD int pop seqstack *S, StackData &x)t /若栈空返回0,否则栈顶元素退出到x并返回1 if( StackEmpty()) return 0; (S->top X=“(S->top) return 1 Gettop int Gettop(SeqStack *S, StackData &x)i /若栈空返回0,否则栈顶元素读到x并返回1 if( StackEmpty()) return 0; (S->top)-; X=“(S->top) return 1:▪ Pop int pop (SeqStack *S, StackData &x) { //若栈空返回0, 否则栈顶元素退出到x并返回1 if ( StackEmpty(S) ) return 0; --(S->top); x = *(S->top); return 1; } ▪ Gettop int Gettop (SeqStack *S, StackData &x) { //若栈空返回0, 否则栈顶元素读到x并返回1 if ( StackEmpty(S) ) return 0; (S->top)--; x = *(S->top); return 1;}