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56 lines (46 loc) · 821 Bytes
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linearqueue.c
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56 lines (46 loc) · 821 Bytes
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#include <stdio.h>
#define QUEUE_CAPACITY 8
int queue[QUEUE_CAPACITY];
int head = 0;
int tail = -1;
int queue_size = 0;
void enqueue(int n)
{
if (queue_size == QUEUE_CAPACITY)
{
printf("queue full!\n");
return ;
}
tail++;
queue_size++;
queue[tail] = n;
}
int dequeue()
{
int r;
if (queue_size == 0)
{
printf("queue empty!\n");
return 0;
}
r = queue[head];
head++;
queue_size--;
return r;
}
int main()
{
int number, r;
do {
printf("input number: ");
scanf("%d", &number);
if (number > 0) {
enqueue(number);
}
else if (number == 0) {
r = dequeue();
printf("[%d]\n",r);
}
} while (number >= 0);
return 0;
}