Create stack-using-array.c (#393)

11. Stack/stack-using-array.c

@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define MAX 4
+
+int arr[MAX];
+int top = -1;
+
+int isEmpty()
+{
+    if (top == -1)
+    {
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int isFull()
+{
+    if (top == MAX - 1)
+    {
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+void push(int data)
+{
+    if (isFull())
+    {
+        printf("stack overflow\n");
+        return;
+    }
+    top += 1;
+    arr[top] = data;
+}
+
+int pop()
+{
+    int data;
+    if (isEmpty())
+    {
+        printf("stack underflow");
+        exit(1);
+    }
+    data = arr[top];
+    top -= 1;
+    return data;
+}
+
+int peek()
+{
+    if (isEmpty)
+    {
+        printf("stack underflow\n");
+        exit(1);
+    }
+    return arr[top];
+}
+
+int print()
+{
+    if (isEmpty())
+    {
+        printf("stack underflow\n");
+    }
+    else
+    {
+        for (int i = top; i >= 0; i--)
+        {
+            printf("%d", arr[i]);
+            printf("\n");
+        }
+    }
+}
+
+int main()
+{
+    int choice, data;
+    while (1)
+    {
+        printf("\n");
+        printf("1. push\n");
+        printf("2. pop\n");
+        printf("3. print top\n");
+        printf("4. print all\n");
+        printf("5. quit\n");
+        printf("\n");
+        printf("enter your choice: ");
+        scanf("%d", &choice);
+        printf("\n");
+
+        switch (choice)
+        {
+        case 1:
+            printf("enter element to be pushed: ");
+            scanf("%d", &data);
+            push(data);
+            break;
+
+        case 2:
+            data = pop();
+            printf("deleted element is %d\n", data);
+            break;
+
+        case 3:
+            printf("the top element in stack is %d\n", arr[top]);
+            break;
+
+        case 4:
+            print();
+            break;
+
+        case 5:
+            exit(1);
+
+        default:
+            printf("wrong choice\n");
+        }
+    }
+
+    return 0;
+}