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DS/C/endsem-omnibus/stacks.c

@@ -0,0 +1,79 @@
+#include <stdio.h>
+#define MAX_SIZE 100
+
+int top = -1;
+int stack[MAX_SIZE];
+
+void push(int c) {
+    if (top < MAX_SIZE - 1) {
+        stack[++top] = c;
+    } else {
+        printf("Stack overflow\n");
+    }
+}
+
+int pop() {
+    if (top >= 0) {
+        return stack[top--];
+    } else {
+        printf("Stack underflow\n");
+        return -1;
+    }
+}
+
+void display() {
+    printf("The stack is: ");
+    for (int i = top; i >= 0; i--) {
+        printf("%d\t", stack[i]);
+    }
+    printf("\n");
+}
+
+int isEmpty() {
+    return top == -1;
+}
+
+int peek() {
+    if (!isEmpty()) {
+        return stack[top];
+    } else {
+        printf("Stack is empty\n");
+        return -1;
+    }
+}
+
+int main() {
+    int choice;
+    while (1) {
+        printf("1. Push\n2. Pop\n3. Display\n4. Peek\n5. Check if Empty\n6. Exit\n");
+        scanf("%d", &choice);
+        switch (choice) {
+            case 1:
+                printf("Enter an element: ");
+                int element;
+                scanf("%d", &element);
+                push(element);
+                break;
+            case 2:
+                printf("The top element is: %d\n", pop());
+                break;
+            case 3:
+                display();
+                break;
+            case 4:
+                printf("The top element is: %d\n", peek());
+                break;
+            case 5:
+                if (isEmpty()) {
+                    printf("Stack is empty\n");
+                } else {
+                    printf("Stack is not empty\n");
+                }
+                break;
+            case 6:
+                return 0;
+            default:
+                printf("Invalid choice.\n");
+        }
+    }
+}