Data Structure - Linked List Structure

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
//Define a structure
struct Student{
char name[20];
int number;
struct Student *next;
};

int main() {
    //Function declaration
    struct Student * createLink();
    void printLink(struct Student * pHead);
    struct Student * insertLink(struct Student * pHead);
    void deleteLink(struct Student * pHead);
    void menu(struct Student * pHead);
    //Define a pointer variable that points to the structure, to change the head node of the structure
    struct Student * pHead=NULL;
    menu(pHead);
}

void menu(struct Student * pHead){
    int i;
    printf("1. Create a linked list 2. Add a node to the linked list 3. Delete the node of the linked list 4. Print the linked list\n");
    printf("Please enter the operation command:");
    scanf("%d",&i);
    switch (i){
    case 1:
        pHead=createLink();
        printf("Operation succeeded\n");
        menu(pHead);
        break;
    case 2:
        pHead=insertLink(pHead);
        printf("Operation succeeded\n");
        menu(pHead);
        break;
    case 3:
        deleteLink(pHead);
        printf("The operation succeeded\n");
        menu(pHead);
        break;
    case 4:
        printLink(pHead);
        printf("The operation succeeded\n");
        menu (pHead);
        break;
    default:
        printf("The input parameter is invalid!\n");
        menu(pHead);
        break;
    }
}


//Create a linked list
struct Student * createLink(){
    //Define a pointer variable to the structure
    struct Student * pHead=NULL;
    //Define two pointers to the structure
    struct Student *pOld,*pNew;
    //Allocate a piece of memory, then let the two pointers point to it
    pHead=pNew=pOld=(struct Student*)malloc(sizeof (struct Student));
    printf("Please enter a student's name:");
    scanf("%s",&pNew->name);
    printf("Please enter a student's student number:");
    scanf("% d",&pNew->number);
    while(pNew->number!=0){
        pOld=pNew; // Point the old pointer to the new pointer
        pNew=(struct Student*)malloc(sizeof(struct Student));
        printf("Please enter a student's name:");
        scanf("%s",&pNew->name);
        printf("Please enter a student's name Student number: ");
        scanf("%d",&pNew->number);
        pOld->next=pNew;
    }
    pOld->next=NULL;
    free(pNew);
    return pHead;
}

//Print the elements in the linked list
void printLink(struct Student * pHead){
    while(1){
        if(pHead!=NULL){
            printf("The student's name is: %s, the student's student number is %d\n",pHead->name,pHead ->number);
            pHead=pHead->next; //Point the pointer to the next node
        }else{
            break;
        }
    }
}

//Insert data into the linked list, pHead represents the head node of the linked list to be inserted
struct Student * insertLink(struct Student * pHead){
    //Create a new node
    struct Student * pNew,*pTemp;
    pNew=(struct Student*) malloc(sizeof(struct Student));
    printf("Please enter name:");
    scanf("%s",&pNew->name);
    printf("Please enter student number:");
    scanf("%s", &pNew->number);

    pTemp=pHead->next; //The address of the next node of the original pHead node
    pHead->next=pNew;
    pNew->next=pTemp;
    return pHead;
}

//Delete the linked list, pHead is the head node pointer, index is the node to be deleted
void deleteLink(struct Student * pHead){
    int index;
    int i;
    struct Student * pTemp,*pTemp2,*pTemp3;
    printf("Please enter the index number of the node to be deleted:");
    scanf("%d",&index);
    pTemp2=pHead;
    //delete the second node
    for(i=0;i<index-1;i++ ){
        pTemp3=pTemp2;
        pTemp=pTemp2->next; //pointer to the second node
        pTemp2=pTemp;
    }
    pTemp3->next=pTemp->next;
    free(pTemp);
}