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845天前/*顺序队列 |
*/ |
#define maxsize 100 |
typedef struct |
{ |
int data[maxsize]; |
int front; |
int rear; |
} sqqueue; |
int sqinit ( sqqueue *p ) //队列初始化 |
{ |
p->front=0; |
p->rear=0; |
return 1; |
} |
int enqueue ( sqqueue *q, int e ) //入队 |
{ |
if ( ( q->rear+1 ) %maxsize==q->front ) |
return 0; |
else |
q->data[q->rear]=e; |
q->rear= ( q->rear+1 ) %maxsize; |
return 1; |
} |
int dequeue ( sqqueue *q ) //出队 |
{ |
int e; |
if ( q->front==q->rear ) |
return 0; |
e=q->data[q->front]; |
q->front= ( q->front+1 ) %maxsize; |
return e; |
} |
int empty ( sqqueue *q ) //判空 |
{ |
int v; |
if ( q->front==q->rear ) |
v=1; |
else |
v=0; |
return v; |
} |
int gethead ( sqqueue *q ) //取得头元素 |
{ |
int e; |
if ( q->front==q->rear ) |
e=-1; |
else |
e=q->data[q->front]; |
return e; |
} |
void display ( sqqueue *q ) //显示所有元素 |
{ |
int s; |
s=q->front; |
printf ( "the sequeue is display:\n" ); |
if ( q->front==q->rear ) |
printf ( "the sequeue is empty!" ); |
else |
{ |
while ( s<q->rear ) |
{ |
printf ( "->%d", q->data[s] ); |
s= ( s+1 ) %maxsize; |
} |
printf ( "\n" ); |
} |
} |
main ( sqqueue *head ) //函数使用样例 |
{ |
int n,i,m,x,y,select,xq; |
printf ( "create a empty sequeue\n" ); |
sqinit ( head ); |
printf ( "please input the sequeue length:\n" ); |
scanf ( "%d",&n ); |
for ( i=0; i<n; i++ ) |
{ |
printf ( "please input a sequeue value:\n" ); |
scanf ( "%d",&m ); |
enqueue ( head,m ); |
} |
printf ( "head->rear:%d\n",head->rear ); |
printf ( "head->front:%d\n",head->front ); |
display ( head ); |
printf ( "select 1 **** enqueue() \n" ); |
printf ( "select 2 **** dequeue() \n" ); |
printf ( "select 3 **** empty () \n" ); |
printf ( "select 4 **** gethead() \n" ); |
printf ( "select 5 **** display() \n" ); |
printf ( "please select (1--5):" ); |
scanf ( "%d",&select ); |
switch ( select ) |
{ |
case 1: |
{ |
printf ( "please input a value :\n " ); |
scanf ( "%d",&x ); |
enqueue ( head,x ); |
display ( head ); |
break; |
} |
case 2: |
{ |
dequeue ( head ); |
display ( head ); |
break; |
} |
case 3: |
{ |
if ( empty ( head ) ) |
printf ( "the sequeue is empty" ); |
else |
printf ( "the sequeue is full" ); |
} |
case 4: |
{ |
y=gethead ( head ); |
printf ( "output head value:%d\n",y ); |
break; |
} |
case 5: |
{ |
display ( head ); |
break; |
} |
} |
} |
} |
