#include<stdio.h> #include<stdlib.h> #include<malloc.h> #define ERROR 0 #define OK 1 #define STACK_INT_SIZE 10 /*存储空间初始分配量*/ typedef int ElemType; /*定义元素的类型*/ typedef struct{ ElemType *base; ElemType *top; }SqStack; int InitStack(SqStack *S); /*构造空栈*/ int push(SqStack *S,ElemType e); /*入栈*/ int Pop(SqStack *S,ElemType *e); /*出栈*/ int CreateStack(SqStack *S); /*创建栈*/ void PrintStack(SqStack *S); /*出栈并输出栈中元素*/ int InitStack(SqStack *S){ S->base=(ElemType *)malloc(STACK_INT_SIZE *sizeof(ElemType)); if(!S->base) return ERROR; S->top=S->base; return OK; }/*InitStack*/ int Push(SqStack *S,ElemType e){ if(S->top-S->base==STACK_INT_SIZE) //推断栈满 return ERROR; *(S->top)=e;//S->top=&e是错的 S->top++; return OK; }/*Push*/ int Pop(SqStack *S,ElemType *e){ if(S->base==S->top) return ERROR; *e=*(S->top-1);//e=S->top-1为啥是错的呢 S->top--; return OK; }/*Pop*/ int CreateStack(SqStack *S){ int e; if(InitStack(S)) printf("Init Success! "); else{ printf("Init Fail! "); return ERROR; } printf("input data:(Terminated by inputing a character) "); while(scanf("%d",&e)) Push(S,e); return OK; }/*CreateStack*/ void PrintStack(SqStack *S){ ElemType e; while(Pop(S,&e)) printf("%3d",e); }/*Pop_and_Print*/ int main(){ SqStack ss; printf(" 1-createStack "); CreateStack(&ss); printf(" 2-Pop&Print "); PrintStack(&ss); printf(" "); return 0; }
关于出栈中的e=S->top-1,理论上e保存的是S->top-1地址,而这个地址又保存着S->top-1存放的值,那么e也应该指向该值,
同一时候虽然S->top--出栈,但原有的数值被删除了么,假设该栈存储利用的是数组而不是数组指针呢?
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