Added delete node function code in C && Factorial in C++

CODE in C/Data Structures/delete_node.c

@@ -0,0 +1,39 @@
+#include<stdio.h>
+struct Node{
+    int val;
+    struct Node* next;
+
+};
+struct Node *newNode(int data){
+    struct Node *n = (struct Node *)malloc(sizeof(struct node *));
+    n->val = data;
+    n->next==NULL;
+    return n;
+}
+void insertAtTail(struct Node* head, int x){
+    if(head==NULL){
+        head = newNode(x);
+        return;
+    }
+    struct Node* temp=head;
+    while(temp->next!=NULL){
+        temp=temp->next;
+    }
+    temp->next=newNode(x);
+    return;
+}
+void deleteNode(struct Node* del){
+    if(del==NULL) return;
+    if(del->next==NULL) {
+        printf("Couldn't be deleted\n");
+        return;
+    }
+    struct Node* temp=del->next;
+    del->val = del->next->val;
+    del->next = del->next->next;
+    delete(temp);
+    return;
+}
+int main(){
+
+}

CODE in C/Mathematical/factorial.cpp

@@ -0,0 +1,13 @@
+#include<bits/stdc++.h>
+using namespace std;
+long long int fact(int n){
+    if(n==0) return 1;
+    return n*fact(n-1);
+}
+int main(){
+    int n;
+    cout<<"enter the number: ";
+    cin>>n;
+    if(n>=0) cout<<"Factorial of number is "<<fact(n)<<endl;
+    else cout<<"There is no factorial for negative numbers"<<endl;
+}