Singly list

#include<stdio.h>

#include<stdlib.h>

menu();

add();

addpos();

search();

searchpos();

searchval();

Delete();

deletepos();

deleteval();

insertfirst();

insertlast();

display();





typedef struct node

{

    int a;

    char s[20];

    struct node *next;

} node;

node *head=NULL;

int searchval()

{

    int b,v;

    node *list=head;

    printf("Enter Your Age:");

    scanf("%d",&v);



    while(1)

    {

        if(list->a==v)

        {

            printf("Name:%s\n",list->s);

            printf("Age:%d\n",list->a);

            break;

        }

        list=list->next;

    }

    printf("\n1.Menu\n");

    printf("2.Exit\n");

    printf("Choose a Option:");

    scanf("%d",&b);

    switch(b)

    {



    case 1:

    {

        menu();

        break;

    }

    case 2:

    {

        exit(0);

    }

    default:

    {

        printf("You Choose Wrong Option!!\a\nPlease Choose Correct Option\n");

        menu();



    }



    }



}





int searchpos()

{

    int p,v,b;

    node *list=head;

    printf("Enter Your Position:");

    scanf("%d",&p);

    if(p==1)

    {

        printf("Name:%s\n",list->s);

        printf("Age:%d\n\n",list->a);

    }

    else

    {

        p=p-2;

        while(p--)

        {

            list=list->next;

        }

        printf("Name:%s\n",list->next->s);

        printf("Age:%d\n",list->next->a);

    }

    printf("\n1.Menu\n");

    printf("2.Exit\n");

    printf("Choose a Option:");

    scanf("%d",&b);

    switch(b)

    {



    case 1:

    {

        menu();

        break;

    }

    case 2:

    {

        exit(0);

    }

    default:

    {

        printf("You Choose Wrong Option!!\a\nPlease Choose Correct Option\n");

        menu();



    }



    }

}

int search()

{

    int b;

    printf("\n1.Search By position\n");

    printf("2.Search By Value\n");

    printf("3.Menu\n");

    printf("4.Exit\n");

    printf("Choose a Option");

    scanf("%d",&b);

    switch(b)

    {



    case 1:

    {

        searchpos();

        break;

    }

    case 2:

    {

        searchval();

        break;

    }

    case 3:

    {

        menu();

        break;

    }

    case 4:

    {

        exit(0);

    }

    default:

    {

        printf("You Choose Wrong Option!!\a\nPlease Choose Correct Option\n");

        search();



    }



    }

}

    int deleteval()

    {

        int b,v;

        node *list=head,*temp;

        printf("Enter Your Value:");

        scanf("%d",&v);

        if(list->a==v)

        {

            head=list->next;

            free(list);

        }

        else

        {

            while(1)

            {

                if(list->next->a==v)

                {

                    temp=list->next;

                    break;

                }

                else

                {

                    list=list->next;

                }

            }

            list->next=temp->next;

            free(temp);

        }

        printf("\n\n1.Menu\n");

        printf("2.Exit\n");