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seqqueue.c
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seqqueue.c
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#include "seqqueue.h"
void SeqQueueInit(SeqQueue* seq)
{
if(seq==NULL)
{
//非法输入
return;
}
seq->head = 0;
seq->tail = 0;
seq->size = 0;
}
void SeqQueuePush(SeqQueue* seq,SeqQueueType value)
{
if(seq==NULL)
{
//非法输入
return;
}
if(seq->size == SeqQueueMaxSize)
{
//队列已满
return;
}
if(seq->tail==SeqQueueMaxSize&&seq->size<SeqQueueMaxSize)
//此时tail已经到了数组末尾,而size还没有达到最大值,说明
//head前有空出的位置,所以将tail赋值0,直到size达到最大值,才说明队列已经满了
{
seq->tail = 0;
}
seq->data[seq->tail++] = value;
seq->size++;
}
void SeqQueuePop(SeqQueue* seq)
{
if(seq==NULL)
{
//非法输入
return;
}
if(seq->size == 0)
{
//空队列
return;
}
if(seq->head == SeqQueueMaxSize)
{
seq->head = 0;
}
else
{
seq->head++;
}
seq->size--;
}
int SeqQueueGetTop(SeqQueue* seq,SeqQueueType* value)
{
if(seq==NULL)
{
//非法输入
return 0;
}
if(seq->size==0)
{
//空队列
return 0;
}
*value = seq->data[seq->head];
return 1;
}
void SeqQueuePrintChar(SeqQueue* seq,const char* msg)
{
if(seq==NULL)
{
//非法输入
return;
}
size_t i = 0;
for(;i<seq->size;i++)
{
if(seq->head+i==SeqQueueMaxSize)
{
size_t j = 0;
for(;j<seq->tail;j++)
{
printf("[%c] ",seq->data[j]);
}
break;
}
printf("[%c] ",seq->data[seq->head+i]);
}
printf("\n");
printf("[%s]\n",msg);
}
/*void Test()
{
SeqQueue seq;
SeqQueueInit(&seq);
SeqQueuePush(&seq,'a');
SeqQueuePush(&seq,'b');
SeqQueuePush(&seq,'c');
SeqQueuePush(&seq,'d');
SeqQueuePrintChar(&seq,"尝试四个元素入队列");
SeqQueueType value;
int ret;
ret = SeqQueueGetTop(&seq,&value);
printf("except: 1 ,real: %d\n",ret);
printf("except: a ,real: %c\n",value);
SeqQueuePop(&seq);
ret = SeqQueueGetTop(&seq,&value);
printf("except: 1 ,real: %d\n",ret);
printf("except: b ,real: %c\n",value);
SeqQueuePop(&seq);
ret = SeqQueueGetTop(&seq,&value);
printf("except: 1 ,real: %d\n",ret);
printf("except: c ,real: %c\n",value);
ret = SeqQueueGetTop(&seq,&value);
printf("except: 1 ,real: %d\n",ret);
printf("except: c ,real: %c\n",value);
SeqQueuePop(&seq);
ret = SeqQueueGetTop(&seq,&value);
printf("except: 1 ,real: %d\n",ret);
}*/