stackUsingArray.c: Add stack using array in C

Add stack data structure code in C. Closes #315
NITSkmOS · Oct 14, 2018 · 3fc4661 · 3fc4661
1 parent 67e0d9b
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diff --git a/README.md b/README.md
@@ -31,7 +31,11 @@ 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)                |                                       |                                       |
-| [Stack](https://en.wikipedia.org/wiki/Stack_(abstract_data_type))                               |                                       |                                       | [:octocat:](stack/Java)               | [:octocat:](stack/Python)             |
+<<<<<<< HEAD
+| [Stack](https://en.wikipedia.org/wiki/Stack_(abstract_data_type))                               | [:octocat:](stack/C )                 |                                       | [:octocat:](stack/Java)               | [:octocat:](stack/Python)             |
+=======
+| [Stack](https://en.wikipedia.org/wiki/Stack_(abstract_data_type))                               | [:octocat:](stack/C)                  |                                       | [:octocat:](stack/Java)               | [:octocat:](stack/Python)             |
+>>>>>>> 8f2ad6f... Add stack in C to README.md
 | [Linear Linked List](https://en.wikipedia.org/wiki/Linked_list)                                 | [:octocat:](linked_list/C)            | [:octocat:](linked_list/Cpp)          |                                       | [:octocat:](linked_list/Python)       |
 | [AVL Tree](https://en.wikipedia.org/wiki/AVL_tree)                                              | [:octocat:](avl_tree/C)               |                                       | [:octocat:](avl_tree/Java)            | [:octocat:](avl_tree/Python)          |
 

diff --git a/stack/C/stackUsingArray.c b/stack/C/stackUsingArray.c
@@ -0,0 +1,39 @@
+#include<stdio.h>
+#include<stdlib.h>
+
+/*Using variable i to push elements then pop and print the elements. */
+
+int main() {
+	void push(int *arr, int *top, int n, int i);
+	int pop(int *arr, int *top);
+	// number of elements
+	int n = 6;
+	int arr[n], top = -1;
+	// push all elements into the stack
+	for(int i = 0; i < n; i++) {
+		push(arr, &top, n, i);
+	}
+	printf("\n");
+	// pop elements one by one.
+	for(int i = 0; i < n; i++) {
+		printf("%d ", pop(arr, &top));
+	}
+}
+
+void push(int *arr, int *top, int n, int i) {
+	if(*top == n) {
+		printf("\nStack is full. \n");
+	} else {
+		arr[++(*top)] = i;
+	}
+}
+
+int pop(int *arr, int *top) {
+	if(*top == -1) {
+		printf("\n Stack empty!\n");
+		exit(1);
+	} else {
+		return(arr[(*top)--]);
+	}
+	return 0;
+}