取栈顶元素 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(s)) return 0; (S->top) X=*(S->top); return 1▪ 取栈顶元素 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; }