c/c++ 线性栈

c/c++ 线性栈

线性栈

下面的代码实现了以下功能

函数	功能描述
push	压入
pop	弹出
show_list	打印
clear	移动top指针到栈底
destroy	释放所有内存空间

seqstack.h

#ifndef __SEQSTACK__
#define __SEQSTACK__

#include <stdio.h>
#include <malloc.h>
#include <assert.h>
#include <memory.h>
#include <stdbool.h>

#define SEQSTACK_INIT_SIZE 8
#define ADD_SIZE 1000

typedef int ElemType;

typedef struct seqstack{
  int size;
  ElemType *base;
  ElemType *top;
}seqstack;

void init(seqstack*);
void push(seqstack*, ElemType);
void show_list(seqstack*);
void pop(seqstack*);
int length(seqstack*);
void clear(seqstack*);
void destroy(seqstack*);
#endif

seqstack.c

#include "seqstack.h"

bool reInit(seqstack* seq){
  ElemType* new = (ElemType*)realloc(seq->base, ADD_SIZE *sizeof(ElemType));
  if(NULL == new)return true;
  if(seq->base != new){
    seq->base = new;
    seq->top = seq->base + seq->size + 1;
  }
  return false;
}
void init(seqstack* seq){
  ElemType* e = (ElemType*)malloc(sizeof(ElemType) * SEQSTACK_INIT_SIZE);
  seq->base = seq->top = e;
  seq->size = 0;
}
void push(seqstack* seq, ElemType x){
  if(seq->size >= SEQSTACK_INIT_SIZE && reInit(seq)){
    printf("stack is full\n");
    return;
  }
  //先赋值，后移动top的指向
  *((seq->top)++) = x;
  seq->size++;
}
void show_list(seqstack* seq){
  ElemType* e = seq->top;
  while(e-- != seq->base){
    printf("%d\n",*e);
  }
}
void pop(seqstack* seq){
  --seq->top;
  seq->size--;
}
int length(seqstack* seq){
  return seq->size;
}
void clear(seqstack* seq){
  seq->top = seq->base;
  seq->size = 0;
}
void destroy(seqstack* seq){
  free(seq->base);
}

seqstackmain.c

#include "seqstack.h"

int main(){
  seqstack list;
  init(&list);
  int select = 1;
  ElemType item;
  int index;
  while(select){
    printf("*****************************************\n");
    printf("*** [1]   push        [2]  pop        ***\n");
    printf("*** [3]   show_list   [4]  length     ***\n");
    printf("*** [5]   clear       [6]  destroy    ***\n");
    printf("*** [0]   quit                        ***\n");
    printf("*****************************************\n");
    printf("请选择:>");
    scanf("%d", &select);
    if(0 == select)
      break;
    switch(select){
    case 1:
      printf("请输入要插入的数据>\n");
      scanf("%d",&item);
      push(&list, item);    
      show_list(&list);
      break;
    case 2:
      pop(&list);   
      show_list(&list);
      break;
    case 3:
      show_list(&list);
      break;
    case 4:
      printf("length is %d\n", length(&list));
      show_list(&list);
      break;
    case 5:
      clear(&list);
      show_list(&list);
      break;
    case 6:
      destroy(&list);
      break;
    default:
      printf("输入的选择错误，请重新选择\n");
      break;
    }
  }
  destroy(&list);
}