栈的c语言顺序实现（动态申请空间）

下图表示顺序栈中数据元素和栈指针之间的对应关系

#include<stdio.h>
#include<malloc.h>
#define SIZE 100    //栈的最大长度
#define STEPTSIZE 10    //栈每次增长的长度
typedef char ElemType;

/*栈的定义*/
typedef struct stack{

    ElemType *base;
    ElemType *top;
    int stackSize;

}stack;

/*栈顶初始化*/
void initAStack(stack *s){
    
    s->base =(ElemType *)malloc(SIZE*sizeof(ElemType));
    if(s->base == NULL) exit(0);
    
    s->top = s->base;
    s->stackSize = SIZE;

}

/*进栈*/
void push(stack *s,ElemType e){

    /*栈满*/
    if( (s->top - s->base) == SIZE){
        s->base = (ElemType *)realloc(s->base,(SIZE+STEPTSIZE)*sizeof(ElemType));
        s->stackSize  += STEPTSIZE;    
    }

    *(s->top) =e;
    s->top++;
    

}

/*遍历*/
void traverseStack(stack s){
    
    while(s.top != s.base){
        s.top--;

        printf("%c\t",*s.top);
    }
    printf("\n");
    
}

/*出栈*/
void pop(stack *s){
    char *tem;
    tem = s->top;
    s->top--;
    free(tem);

}
void main(){
    stack s;
    
    initAStack(&s);
    
    push(&s,'a');
    push(&s,'b');
    push(&s,'c');
    push(&s,'d');
    push(&s,'e');
    traverseStack(s);
    
    pop(&s);
    traverseStack(s);
    
}