diff --git a/Linked_List.c b/Linked_List.c
index ca92b99..c961cfb 100644
--- a/Linked_List.c
+++ b/Linked_List.c
@@ -1,124 +1,22 @@
-/*Write a C program that uses functions to perform the following:
-a) Create a singly linked list of integers
-b) Delete a given integer from the above linked list
-c) Display the contents of the above list after deletion
-CODE:-*/
-#include<stdio.h>
-#include<stdlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+
 struct node
 {
- int data;
- struct node *next;
+    int data;
+    struct node* next;
 };
-struct node *head, *tail = NULL;
-void addNode(int data)
-{
- struct node *newNode=(struct node*)malloc(sizeof(struct node));
- newNode->data=data;
- newNode->next=NULL;
- if(head==NULL)
- {
- head=newNode;
- tail=newNode;
- }
- else
- {
- tail->next = newNode;
- tail = newNode;
- }
-}
-void display()
-{
- struct node *current = head; // the node current will point to head
- if(head==NULL)
- {
- printf("List is empty\n");
- return;
- }
- printf("\nNodes of singly linked list: \n");
- while(current!= NULL)
- {
- printf("%d ", current->data); // each node is printed
- current = current->next;
- }
- printf("\n");
-}
-void delete()
-{
- struct node *ptr,*ptr1;
- int item,i=0,flag,loc,j;
- ptr = head;
- if(ptr == NULL)
- {
- printf("\nEmpty List\n");
- }
- else
- {
- printf("\nWhich integer do you want to delete?\n");
- scanf("%d",&item);
- while (ptr!=NULL)
- {
- if(ptr->data == item)
- {
- printf("Integer found at node %d ",i+1);
- flag=0;
- loc=i;
- break;
- }
- else
- {
- flag=1;
- }
- i++;
- ptr = ptr -> next;
- }
- if(flag==1)
- {
- printf("Integer not found!\n");
- }
- }
- ptr=head;
- for(j=0;j<loc;j++)
- {
- ptr1 = ptr;
- ptr = ptr->next;
- if(ptr == NULL)
- {
- printf("\nDeletion is not possible!");
- return;
- }
- }
- ptr1->next = ptr ->next;
- free(ptr);
- printf("\nDeleted node %d \n",loc+1);
-}
+typedef struct node NODE;
+
+//NODE head = NULL;
+
+
+NODE *first, *second, *third;
+
 int main()
 {
- int n,m,data;
- printf("How many nodes do you want to create?\n");
- scanf("%d",&n);
- for(int i=0;i<n;i++)
- {
- printf("Integer node %d data : ",(i+1));
- scanf("%d",&data);
- addNode(data);
- }
- display();
- delete();
- display();
+    (*first).data = 5;
+    (*first).next = second;
+
+    printf("%d", (*first).data);
 }
-/*OUTPUT:-
-How many nodes do you want to create?
-4
-Integer node 1 data : 13
-Integer node 2 data : 16
-Integer node 3 data : 19
-Integer node 4 data : 21 
-Nodes of singly linked list:
-13 16 19 21
-Which integer do you want to delete?
-19
-Integer found at node 3
-Deleted node 3
-Nodes of singly linked list:
-13 16 21*/
diff --git a/Simple_Interest.c b/Simple_Interest.c
old mode 100755
new mode 100644
index 1929aa4..4ed4cfa
--- a/Simple_Interest.c
+++ b/Simple_Interest.c
@@ -1,12 +1,12 @@
+//Program to Calculate Simple Interest
 #include<stdio.h>
-void main()
-{ float p,r,t,s;
-printf("Enter the principal : ");
-scanf("%f",&p);
-printf("Enter the rate : ");
-scanf("%f",&r);
-printf("Enter the time : ");
-scanf("%f",&t);
-s=(p*r*t)/100;
-printf("SI is %f",s);
+
+#include<conio.h>
+
+void main() {
+  float P, R, T, SI;
+  scanf("%f%f%f", & P, & R, & T);
+  SI = (P * R * T) / 100;
+  printf("%f", SI);
+  getch();
 }
diff --git a/a.out b/a.out
new file mode 100755
index 0000000..27f32d5
Binary files /dev/null and b/a.out differ
diff --git a/count_vowels b/count_vowels
new file mode 100755
index 0000000..d415279
Binary files /dev/null and b/count_vowels differ
diff --git a/count_vowels.c b/count_vowels.c
new file mode 100644
index 0000000..64d5a2f
--- /dev/null
+++ b/count_vowels.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+// Program to count vowels in a string
+int main() {
+  char str[100];
+  int i, count = 0;
+
+  // Ask the user to enter a string
+  printf("Enter a string: ");
+  fgets(str, sizeof(str), stdin); // safer input method than gets()
+
+  // Loop through the string
+  for (i = 0; str[i] != '\0'; i++) {
+    // Check for both uppercase and lowercase vowels
+    if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' ||
+        str[i] == 'u' || str[i] == 'A' || str[i] == 'E' || str[i] == 'I' ||
+        str[i] == 'O' || str[i] == 'U') {
+      count++;
+    }
+  }
+
+  // Display the total number of vowels
+  printf("Number of vowels: %d\n", count);
+
+  return 0;
+}