Add files via upload

Author: sambathkumar02

stack.cpp

@@ -0,0 +1,92 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<malloc.h>
+#include<stdio.h>
+#include<malloc.h>
+struct node
+{
+	int data;
+	struct node *next;
+};
+struct node *top=NULL;
+struct node *push(struct node *);
+struct node *display(struct node *);
+struct node *pop(struct node *);
+int main()
+{
+int option;
+do
+{
+printf("\n MAIN MENU");
+printf("\n 1.push\n2.pop\n3.display");
+printf("\n Enter your option:");
+scanf("%d",&option);
+switch(option)
+{
+case 1:top=push(top);break;
+case 2:top=pop(top);break;
+case 3:top=display(top);break;
+case 4:exit(0);break;
+default:printf("\n enter the correct option");
+}
+}while(option!=4);
+}
+
+
+struct node *push(struct node *top)
+{
+	struct node *ptr,*new_node;
+	int num;
+	printf("\n press -1 to end");
+	printf("\n enter the value of data:");
+	scanf("%d",&num);
+	while(num!=-1)
+	{
+		new_node=(struct node *)malloc(sizeof(struct node));
+		new_node->data=num;
+		if(top==NULL)
+		{
+			new_node->next=NULL;
+			top=new_node;
+		}
+		else
+		{
+			new_node->next=top;
+			top=new_node;
+			
+		}
+		printf("\n enter the data:");
+		scanf("%d",&num);
+	}
+	return top;
+}
+
+struct node *display(struct node *top)
+{
+	struct node *ptr;
+	ptr=top;
+	if(top==NULL)
+		printf("\n the stack is empty");
+	while(ptr->next!=NULL)
+	{
+		printf("\t %d",ptr->data);
+		ptr=ptr->next;
+	}
+	return top;
+}
+
+struct node *pop(struct node *top)
+{
+	struct node * ptr,*preptr;
+	ptr=top;
+	if(top==NULL)
+		printf("\n the stack is empty");
+	top=ptr->next;
+	free(ptr);
+	printf("\n The element is popped");
+	return top;
+}
+	
+	
+	
+