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Code:

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#define s1 50

#define s2 10

struct donor

{

char name[s1];

int age;

char bloodGroup[s2];

char number[s1];

struct donar *next;

};

struct donar *head;

void insert(char *name, int age, char *bloodGroup, char *number)

{

struct donor *donorS = (struct donor *)malloc(sizeof(struct donor));

strcpy(donorS->name, name);

donorS->age = age;

strcpy(donorS->bloodGroup, bloodGroup);

strcpy(donorS->number, number);

donorS->next=NULL;

if(head==NULL)

{

head=donorS;

}

else

{

donorS->next=head;

head=donorS;

}

}

void display()

{

struct donor *temp = head;

while(temp!=NULL)

{

printf("\nDonar Name: %s\n", temp->name);

printf("Donar Age: %d\n", temp->age);

printf("Donar Blood Group: %s\n", temp->bloodGroup);

printf("Donar Number: %s\n", temp->number);

temp=temp->next;

}

}

void search(char *bloodGroup)

{

struct donor *temp = head;

while(temp!=NULL)

{

if(strcmp(temp->bloodGroup,bloodGroup)==0)

{

printf("\nDonar Name: %s\n", temp->name);

printf("Donar Age: %d\n", temp->age);

printf("Donar Blood Group: %s\n", temp->bloodGroup);

printf("Donar Number: %s\n", temp->number);

}

temp=temp->next;

}

}

int main()

{

char name[s1];

int age;

char bloodGroup[s2];

char number[s1];

int n;

printf("\n\n\n\t\t\t\t __ __ ___ | | ___ ___ _ __ ___ ___ \n");

printf("\t\t\t\t \\ \\ /\\ / / / _ \\ | | / __| / _ \\ | '_ ` _ \\ / _ \\ \n");

printf("\t\t\t\t \\ V V / | __/ | | | (__ | (_) | | | | | | | | __/ \n");

printf("\t\t\t\t \\_/\\_/ \\___| |_| \\___| \\___/ |_| |_| |_| \\___| \n");

do

{

printf("\n1. Add Donor Details.\n2. Search Donor.\n3. View All Donor.\n4. Exit.\n");

printf("\nChose a Option: ");

scanf("%d", &n);

switch(n)

{

case 1:

getchar();

printf("\nEnter name: ");

gets(name);

printf("Enter Age: ");

scanf("%d", &age);

getchar();

printf("Enter Blood Group: ");

gets(bloodGroup);

printf("Enter Number: ");

gets(number);

insert(name, age, bloodGroup, number);

break;

case 2:

printf("Enter Blood Group: ");

scanf("%s", &bloodGroup);

search(bloodGroup);

break;

case 3:

display();

break;

case 4:

exit(0);

break;

default:

printf("\nWrong!! Option Choses.\n");

break;

}

}

while(n!=4);

return 0;

}