Unit : 05 – Structure & Union

1) Write a program to define structure with tag state with fields state name, number of districts and total population. Read and display the data.

#include<stdio.h>
#include<conio.h>
struct state {
    char name[50];
    int num_dis;
    int population;
};
void main()
{
	int i;
	struct state s[3];
	clrscr();
   	for(i=0;i<3;i++){
      		printf("Enter name of state %d: ", i+1);
      		scanf("%s", &s[i].name);
      		printf("Enter number of districts in %s: ", s[i].name);
      		scanf("%d", &s[i].num_dis);
      		printf("Enter total population of %s in Lakh: ",s[i].name);
      		scanf("%d", &s[i].population);
      		printf("\n");
	}
	for (i=0;i<3;i++){
		printf("State name: %s\n", s[i].name);
		printf("Number of districts: %d\n", s[i].num_dis);
		printf("Total population: %d Lakh\n", s[i].population);
 	}
	getch();
}

2) Write a program to create a structure of 5 student’s roll_no and name and display the records. Use array of structure.

#include <stdio.h>
#include <conio.h>
struct student {
    int roll_no;
    char name[50];
};

void main() {
int i;
struct student s[5];
clrscr();
    for (i = 0; i < 5; i++) {
	printf("Enter roll number for student %d: ", i+1);
	scanf("%d", &s[i].roll_no);
	printf("Enter name for student %d: ", i+1);
	scanf("%s", s[i].name);
	printf("\n");
    }
    printf("Student Records:\n");
    for (i = 0; i < 5; i++) {
	printf("Roll number: %d\n", s[i].roll_no);
	printf("Name: %s\n\n", s[i].name);
    }
    getch();
}

3) Write a program to create structure of bank with accno, holder_name and balance and display them for n holders whose balance is less than 5000.

#include<stdio.h>
#include<conio.h>
struct bank
{
    int accno,bal;
    char name[50];
}b[20];
void main()
{
    int i,n;
    clrscr();
    printf("Enter number of bank account holders:");
    scanf("%d",&n);
    for (i=0;i<n;i++)
    {
	printf("Enter account number for holder %d:",i+1);
	scanf("%d", &b[i].accno);
	printf("Enter name for holder %d:",i+1);
	scanf("%s", b[i].name);
	printf("Enter balance for holder %d:",i+1);
	scanf("%d", &b[i].bal);
	printf("\n");
    }
    printf("Account holders with balance less than 5000:\n");
    for (i=0;i<n;i++)
    {
	if(b[i].bal<5000)
	{
	    printf("Account number:%d\n",b[i].accno);
	    printf("Account holder name:%s\n", b[i].name);
	    printf("Balance:%d\n\n",b[i].bal);
	}
    }
    getch();
}

4) Write a program to create union of student’s roll_no and name and display the records.

#include <stdio.h>
#include <conio.h>
union student {
    int roll_no;
    char name[50];
};

void main() {
    union student s;
    clrscr();

    // Read in data for student
    printf("Enter roll number for student: ");
    scanf("%d", &s.roll_no);
    printf("Enter name for student: ");
    scanf("%s", s.name);

    // Display data for student
    printf("Student Record:\n");
    printf("Roll number: %d\n", s.roll_no);
    printf("Name: %s\n", s.name);

    getch();
}