数据结构:
栈是允许在同一端进行插入和删除操作的特殊线性表。允许进行插入和删除操作的一端称为栈顶(top),另一端为栈底(bottom);栈底固定,而栈顶浮动;栈中元素个数为零时称为空栈。插入一般称为进栈(PUSH),删除则称为退栈(POP)。栈也称为后进先出表。
操作系统:
由编译器自动分配释放 ,存放函数的参数值,局部变量的值等。其操作方式类似于数据结构中的栈
栈使用的是一级缓存, 他们通常都是被调用时处于存储空间中,调用完毕立即释放。
双端栈模板代码:
#define FALSE 0
#define M 100
typedef struct
{
StackElementType Stack[M];
StackElementType top[2]; /*top[0]和top[1]分别为两个栈顶指示器*/
}DqStack;
/*初始化操作。*/
void InitStack(DqStack *S)
{
S->top[0]=-1;
S->top[1]=M;
}
/*进栈操作。*/
int Push(DqStack *S,StackElementType x,int i)
{
/*把数据元素x压入i号堆栈*/
if(S->top[0]+1==S->top[1]) /*栈已满*/
return(FALSE);
switch(i)
{
case 0:
S->top[0]++;
S->Stack[S->top[0]]=x;
break;
case 1:
S->top[1]–;
S->Stack[S->top[1]]=x;
break;
default: /*参数错误*/
return(FALSE)
}
return(TRUE);
}
/*出栈操作。*/
int Pop(DqStack *S,StackElementType *x,int i)
{
/* 从i 号堆栈中弹出栈顶元素并送到x中 */
switch(i)
{
case 0:
if(S->top[0]==-1)
return(FALSE);
*x=S->Stack[S->top[0]];
S->top[0]–;
break;
case 1:
if(S->top[1]==M)
return(FALSE);
*x=S->Stack[S->top[1]];
S->top[1]++;
break;
default:
return(FALSE);
}
return(TRUE);
}
波比源码 » 栈操作之双端顺序栈
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