Question

Write a menu driven program to create a linked list of a class of students and perform the following
operations:
a. Write out the contents of the list

b. Edit the details pf a specified student

c. Count the number of students above 21 years and 55 kg weight

Answer 1

C CODE:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct Student
{
char name[20];
int weight;
int age;
struct Student *next;
};
struct Student *insert(struct Student *head,char n[20],int w,int a)
{
struct Student *newnode=(struct Student *)malloc(sizeof(struct Student));
strcpy(newnode->name,n);
newnode->weight=w;
newnode->age=a;
newnode->next=NULL;
if(head==NULL)
{
head=newnode;
return head;
}
struct Student *temp=head;
while(temp->next!=NULL)
temp=temp->next;
temp->next=newnode;
return head;
};
void print(struct Student *head)
{
struct Student *temp=head;
while(temp!=NULL)
{
printf("Name: %s Weight: %d Age: %d\n",temp->name,temp->weight,temp->age);
temp=temp->next;
}
}
struct Student *edit(struct Student *head)
{
printf("Enter name of student to edit: ");
char n[20];
scanf("%s",n);
struct Student *p;
p=head;
int f=0;
while(p!=NULL)
{
if(strcmp(p->name,n)==0)
{
f=1;
break;
}
p=p->next;
}
if(f==0)
printf("Student not found\n");
else
{
printf("Enter new name: ");
char m[20];
scanf("%s",m);
printf("Enter new age: ");
int a;
scanf("%d",&a);
printf("Enter new weight: ");
int w;
scanf("%d",&w);
strcpy(p->name,m);
p->age=a;
p->weight=w;
}
return head;
}
void count(struct Student *head)
{
struct Student *p=head;
int count=0;
while(p!=NULL)
{
if(p->age>21&&p->weight>55)
count++;
p=p->next;
}
printf("Total Students above 21 years age and 55 kg weight: %d\n",count);
}
int main()
{
struct Student *head =NULL;
head=insert(head,"John",60,22);
head=insert(head,"David",70,21);
head=insert(head,"Jonny",54,22);
while(1)
{
printf("1: Print List\n");
printf("2: Edit List\n");
printf("3: Count students above 21 years age and 55 kg weight\n");
printf("4: Exit\n");
printf("Enter choice: ");
int n;
scanf("%d",&n);
if(n==1)
print(head);
else if(n==2)
head=edit(head);
else if(n==3)
count(head);
else if(n==4)
break;
else
printf("Wrong choice\n");
}
return 0;
}

Output: