From 6dc883e568ed48f8d87667225ed999615d3c3579 Mon Sep 17 00:00:00 2001
From: karangarg218 <42265308+karangarg218@users.noreply.github.com>
Date: Sat, 3 Oct 2020 14:31:57 +0530
Subject: [PATCH] Created a stack using linked list

This is the linked list implementation of stack in c so that the student may be familiar with both the implementation
---
 Source Code/Stack.c | 73 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 Source Code/Stack.c

diff --git a/Source Code/Stack.c b/Source Code/Stack.c
new file mode 100644
index 0000000..d74fe97
--- /dev/null
+++ b/Source Code/Stack.c	
@@ -0,0 +1,73 @@
+// C program for array implementation of stack 
+#include <limits.h> 
+#include <stdio.h> 
+#include <stdlib.h> 
+  
+// A structure to represent a stack 
+struct Stack { 
+    int top; 
+    unsigned capacity; 
+    int* array; 
+}; 
+  
+// function to create a stack of given capacity. It initializes size of 
+// stack as 0 
+struct Stack* createStack(unsigned capacity) 
+{ 
+    struct Stack* stack = (struct Stack*)malloc(sizeof(struct Stack)); 
+    stack->capacity = capacity; 
+    stack->top = -1; 
+    stack->array = (int*)malloc(stack->capacity * sizeof(int)); 
+    return stack; 
+} 
+  
+// Stack is full when top is equal to the last index 
+int isFull(struct Stack* stack) 
+{ 
+    return stack->top == stack->capacity - 1; 
+} 
+  
+// Stack is empty when top is equal to -1 
+int isEmpty(struct Stack* stack) 
+{ 
+    return stack->top == -1; 
+} 
+  
+// Function to add an item to stack.  It increases top by 1 
+void push(struct Stack* stack, int item) 
+{ 
+    if (isFull(stack)) 
+        return; 
+    stack->array[++stack->top] = item; 
+    printf("%d pushed to stack\n", item); 
+} 
+  
+// Function to remove an item from stack.  It decreases top by 1 
+int pop(struct Stack* stack) 
+{ 
+    if (isEmpty(stack)) 
+        return INT_MIN; 
+    return stack->array[stack->top--]; 
+} 
+  
+// Function to return the top from stack without removing it 
+int peek(struct Stack* stack) 
+{ 
+    if (isEmpty(stack)) 
+        return INT_MIN; 
+    return stack->array[stack->top]; 
+} 
+  
+// Driver program to test above functions 
+int main() 
+{ 
+    struct Stack* stack = createStack(100); 
+  
+    push(stack, 10); 
+    push(stack, 20); 
+    push(stack, 30); 
+  
+    printf("%d popped from stack\n", pop(stack)); 
+  
+    return 0; 
+}