本文实例讲述了C语言用栈和队列实现的回文功能。分享给大家供大家参考,具体如下:
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#include<stdio.h>
#include<malloc.h>//内存分配头文件
#include<math.h>//在math.h中已定义OVERFLOW的值为3
#define SIZE 100
#define STACKINCREMENT 10
#define OK 1
#define ERROR 0
#define TRUE 1
#define FALSE 0
typedef int Status;
typedef struct //栈的结构体
{
char a;
} SElemType;
typedef struct
{
SElemType *base;
SElemType *top;
int stacksize;
} SqStack;
typedef struct //QNode //队列的结构体
{
char b;
struct QNode * next;
} QNode,*QueuePtr;
typedef struct // 链队列类型
{
QueuePtr front; // 队头指针
QueuePtr rear; // 队尾指针
} LinkQueue;
//定义全局变量
SqStack S;
SElemType e;
LinkQueue Q;
QueuePtr p;
char f;
//栈操作
Status InitStack(SqStack *S)
{
S->base=(SElemType *) malloc (SIZE* sizeof (SElemType));
if (!S->base) exit (OVERFLOW);
S->top=S->base;
S->stacksize=SIZE;
return OK;
}
Status Push(SqStack *S,SElemType e)
{
if (S->top-S->base>=S->stacksize)
{
S->base=(SElemType *) malloc ((S->stacksize+STACKINCREMENT)* sizeof (SElemType));
if (!S->base) exit (OVERFLOW);
S->top=S->base+S->stacksize;
S->stacksize+=STACKINCREMENT;
}
*S->top++=e;
return OK;
}
Status Stackempty(SqStack S) //栈是否为空
{
if (S.top==S.base)
return TRUE;
else
return FALSE;
}
Status Pop(SqStack *S,SElemType *e)
{
if (S->top==S->base) return ERROR;
*e=*--S->top;
return OK;
}
Status StackLength(SqStack S) //求栈的长度
{
return (S.top-S.base);
}
//队列操作
Status InitQueue(LinkQueue *Q)
{
Q->front=(QueuePtr) malloc ( sizeof (QNode));
Q->rear=Q->front;
if (!Q->front) exit (OVERFLOW);
Q->front->next=NULL;
return OK;
}
Status EnQueue(LinkQueue *Q, char f)
{
p=(QueuePtr) malloc ( sizeof (QNode));
if (!p) exit (OVERFLOW);
p->b=f;
p->next=NULL;
Q->rear->next=p;
Q->rear=p;
return OK;
}
Status DeQueue(LinkQueue *Q, char *f)
{
if (Q->front==Q->rear) return ERROR;
p=Q->front->next;
*f=p->b;
Q->front->next=p->next;
if (Q->rear==p)
Q->rear=Q->front;
free (p);
return OK;
}
Status QueueLength(LinkQueue Q)
{
int i=0;
p=Q.front;
while (Q.rear!=p)
{
i++;
p=p->next;
}
return i;
}
Status QueueEmpty(LinkQueue Q)
{
if (Q.front==Q.rear)
return TRUE;
else
return FALSE;
}
void main()
{
int i,m;
char n,a[20];
InitStack(&S);
InitQueue(&Q);
gets (a);
for (i=0; a[i]!= '&' ; i++) /////////// &前的数据进栈
{
e.a=a[i];
Push(&S,e);
}
for (i=i+1; a[i]!= '\0' ; i++) ////////// ‘ &'后的数据进入队列
EnQueue(&Q,a[i]);
if ( StackLength(S)!=QueueLength(Q)) /////栈和队列的数据个数不一样
printf ( "NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!" );
else
while (!Stackempty(S)&&!QueueEmpty(Q)) ///////栈和队列里还有数据
{
Pop(&S,&e);
m=e.a;
DeQueue(&Q,&f);
n=f;
if (m!=n)
{
printf ( "NO!!!!!!!!!!!!!!!!!!!!!!" );
break ;
}
}
if (m==n&&Stackempty(S)&&QueueEmpty(Q))
printf ( "YES!!!!!!!!!!!!!!!!!!!!!!" );
}
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运行结果:
希望本文所述对大家C语言程序设计有所帮助。