定义结构类型
typedef int DataType;
typedef struct Stack
{
DataType *_a;
int _top;
int _capacity;
}Stack;
各个函数声明
void StackInit(Stack* ps);
void StackDestroy(Stack* ps);
void StackPush(Stack* ps, DataType x);
void StackPop(Stack* ps);
DataType StackTop(Stack* ps);
int StackEmpty(Stack* ps);
int StackSize(Stack* ps);
函数实现
#include"Stack.h"
void StackInit(Stack* ps)
{
assert(ps);
ps->_a = (DataType*)malloc(sizeof(DataType)* 3);
ps->_top = 0;
ps->_capacity = 3;
}
void StackDestroy(Stack* ps)
{
assert(ps);
free(ps->_a);
ps->_a = NULL;
ps->_top = 0;
ps->_capacity = 0;
}
void StackPush(Stack* ps, DataType x)
{
assert(ps);
if (ps->_top == ps->_capacity)
{
DataType* tmp = realloc(ps->_a, sizeof(DataType)*(ps->_capacity * 2));
if (tmp != NULL)
{
ps->_a = tmp;
}
ps->_capacity = 2 * ps->_capacity;
}
ps->_a[ps->_top] = x;
ps->_top++;
}
void StackPop(Stack* ps)
{
assert(ps);
assert(ps->_top > 0);
ps->_top--;
}
DataType StackTop(Stack* ps)
{
assert(ps);
assert(ps->_top > 0);
return ps->_a[ps->_top - 1];
}
//空返回0,非空返回1
int StackEmpty(Stack* ps)
{
assert(ps);
return ps->_top == 0 ? 0 : 1;
}
int StackSize(Stack* ps)
{
assert(ps);
return ps->_top;
}