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https://github.com/TheAlgorithms/C
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89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
// Queue ADT implementation ... COMP2521
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#include <stdlib.h>
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#include <assert.h>
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#include "queue.h"
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typedef struct node {
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int data;
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struct node *next;
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} NodeT;
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typedef struct QueueRep {
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int length;
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NodeT *head;
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NodeT *tail;
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} QueueRep;
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// set up empty queue
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queue newQueue() {
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queue Q = malloc(sizeof(QueueRep));
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Q->length = 0;
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Q->head = NULL;
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Q->tail = NULL;
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return Q;
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}
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// remove unwanted queue
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void dropQueue(queue Q) {
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NodeT *curr = Q->head;
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while (curr != NULL) {
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NodeT *temp = curr->next;
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free(curr);
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curr = temp;
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}
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free(Q);
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}
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// check whether queue is empty
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int QueueIsEmpty(queue Q) {
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return (Q->length == 0);
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}
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// insert an int at end of queue
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void QueueEnqueue(queue Q, int v) {
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NodeT *new = malloc(sizeof(NodeT));
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assert(new != NULL);
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new->data = v;
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new->next = NULL;
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if (Q->tail != NULL) {
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Q->tail->next = new;
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Q->tail = new;
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} else {
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Q->head = new;
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Q->tail = new;
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}
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Q->length++;
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}
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// remove int from front of queue
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int QueueDequeue(queue Q) {
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assert(Q->length > 0);
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NodeT *p = Q->head;
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Q->head = Q->head->next;
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if (Q->head == NULL) {
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Q->tail = NULL;
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}
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Q->length--;
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int d = p->data;
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free(p);
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return d;
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}
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// By
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// .----------------. .----------------. .----------------. .-----------------. .----------------. .----------------.
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// | .--------------. || .--------------. || .--------------. || .--------------. | | .--------------. || .--------------. |
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// | | _________ | || | _____ _____ | || | __ | || | ____ _____ | | | | ____ ____ | || | ____ | |
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// | | | _ _ | | || ||_ _||_ _|| || | / \ | || ||_ \|_ _| | | | | |_ || _| | || | .' `. | |
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// | | |_/ | | \_| | || | | | | | | || | / /\ \ | || | | \ | | | | | | | |__| | | || | / .--. \ | |
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// | | | | | || | | ' ' | | || | / ____ \ | || | | |\ \| | | | | | | __ | | || | | | | | | |
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// | | _| |_ | || | \ `--' / | || | _/ / \ \_ | || | _| |_\ |_ | | | | _| | | |_ | || | \ `--' / | |
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// | | |_____| | || | `.__.' | || ||____| |____|| || ||_____|\____| | | | | |____||____| | || | `.____.' | |
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// | | | || | | || | | || | | | | | | || | | |
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// | '--------------' || '--------------' || '--------------' || '--------------' | | '--------------' || '--------------' |
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// '----------------' '----------------' '----------------' '----------------' '----------------' '----------------'
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// Email : z5261243@unsw.edu.au
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// hhoanhtuann@gmail.com
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