queue.c: Add queue in C

Closes #56

README.md

@@ -32,7 +32,7 @@ This repository contains examples of various algorithms written on different pro
 
 | Data Structure                                                                                  | C                                     | CPP                                   | Java                                  | Python                                |
 |:----------------------------------------------------------------------------------------------- |:-------------------------------------:|:-------------------------------------:|:-------------------------------------:|:-------------------------------------:|
-| [Queue](https://en.wikipedia.org/wiki/Queue_(abstract_data_type))                               |                                       | [:octocat:](queue/Cpp)                |                                       |                                       |
+| [Queue](https://en.wikipedia.org/wiki/Queue_(abstract_data_type))                               | [:octocat:](queue/C)                  | [:octocat:](queue/Cpp)                |                                       |                                       |
 | [Stack](https://en.wikipedia.org/wiki/Stack_(abstract_data_type))                               | [:octocat:](stack/C )                 |                                       | [:octocat:](stack/Java)               | [:octocat:](stack/Python)             |
 | [Linear Linked List](https://en.wikipedia.org/wiki/Linked_list)                                 | [:octocat:](linked_list/C)            | [:octocat:](linked_list/Cpp)          | [:octocat:](linked_list/Java)         | [:octocat:](linked_list/Python)       |
 | [AVL Tree](https://en.wikipedia.org/wiki/AVL_tree)                                              | [:octocat:](avl_tree/C)               | [:octocat:](avl_tree/Cpp)             | [:octocat:](avl_tree/Java)            | [:octocat:](avl_tree/Python)          |

queue/C/queue.c

@@ -0,0 +1,61 @@
+#include<stdio.h>
+
+// Queue structure
+struct queue {
+    int arr[10];
+    int front, end;
+};
+
+// Initialize the queue
+void init(struct queue *st) {
+    st->front=0;
+    st->end=0;
+}
+
+// Method to check if the queue st is full or empty
+void check(struct queue *st) {
+    if(st->front==0 && st->end==0)
+        printf("The queue is empty!!!!\n");
+    else if(st->end==10)
+        printf("The queue is full!!!!\n");
+}
+
+// Method to insert elements in the queue st
+void enqueue(struct queue *st, int ele) {
+    check(st);
+    st->arr[(st->end)++]=ele;
+}
+
+// Method to remove first element from the queue st
+int dequeue(struct queue *st) {
+    check(st);
+    return st->arr[(st->front)++];
+}
+
+// Method to show elements in the queue st
+void show(struct queue st) {
+    for(int i=st.front; i<st.end; i++)
+        printf("%d",st.arr[i]);
+}
+
+// Driver method
+void main(){
+    struct queue st;
+    init(&st);
+    for(int i=1; i<9; i++)
+        enqueue(&st, i);
+    show(st);
+    putchar('\n');
+    printf("%d\n", dequeue(&st));
+    enqueue(&st, 6);
+    show(st);
+    putchar('\n');
+    enqueue(&st, 9);
+    show(st);
+    putchar('\n');
+    printf("%d\n", dequeue(&st));
+    printf("%d\n", dequeue(&st));
+    printf("%d\n", dequeue(&st));
+
+    putchar('\n');
+}