stack with c

C/stack/stack.c

@@ -0,0 +1,88 @@
+#include <stdio.h>
+
+int MAXSIZE = 8;
+int stack[8];
+int top = -1;
+
+/* Check if the stack is full */
+int isFull() {
+   if (top == MAXSIZE)
+      return 1;
+   else
+      return 0;
+}
+
+/* Check if the stack is empty */
+int isEmpty() {
+   if (top == -1)
+      return 1;
+   else
+      return 0;
+}
+
+/* Add elements into stack */
+void push(int data) {
+   if (!isFull()) {
+      top = top + 1;
+      stack[top] = data;
+   } else {
+      printf("Could not insert data, Stack is full.\n");
+   }
+}
+
+/* Remove element from stack */
+int pop() {
+   int data;
+
+   if (!isEmpty()) {
+      data = stack[top];
+      top = top - 1;
+      return data;
+   } else {
+      printf("Could not retrieve data, Stack is empty.\n");
+   }
+}
+
+/* Returns element at top of stack */
+int peek() {
+   return stack[top];
+}
+
+/* Display the stack */
+void display() {
+   int i;
+
+   if (!isEmpty()) {
+      for (i = top; i >= 0; i--)
+         printf("%d ", stack[i]);
+      printf("\n");
+   } else {
+      printf("Stack is empty.\n");
+   }
+}
+
+int main() {
+   // push items on to the stack
+   push(3);
+   push(5);
+   push(9);
+   push(1);
+   push(12);
+   push(15);
+
+   printf("Element at top of the stack: %d\n", peek());
+   printf("Elements: \n");
+
+   // print stack data
+   display();
+
+   // remove element from stack
+   printf("\nElement popped: %d\n", pop());
+   printf("Element at top of the stack: %d\n", peek());
+   printf("Elements: \n");
+
+   // print stack data
+   display();
+
+   return 0;
+}