C Sample File : Structure and Union
Structure :
// Program To Demonstrate Simple
Structure
#include<stdio.h>
#include<conio.h>
struct student
{
char
name[10];
char
clas[10];
int rno;
int age;
};
void main()
{
student s;
clrscr();
printf("Enter Name Of Student : ");
scanf("%s",s.name);
printf("Enter Class Of Student :
");
scanf("%s",s.clas);
printf("Enter Roll No : ");
scanf("%d",&s.rno);
printf("Enter Age Of Student : ");
scanf("%d",&s.age);
printf("\n=============================\n");
printf("Name Class RollNo Age\n");
printf("\n=============================\n");
printf("%s",s.name);
printf("\t%s",s.clas);
printf("\t%d",s.rno);
printf("\t%d",s.age);
printf("\n=============================\n");
getch();
}
Output :
Enter
Name Of Student : Dharminder
Enter
Class Of Student : MCA
Enter
Roll No : 935
Enter
Age Of Student : 21
===================================
Name Class
RollNo Age
===================================
DharminderMCA MCA
935 21
===================================
// Program To Demonstrate Array
Of Structure
#include<stdio.h>
#include<conio.h>
struct student
{
char
name[10];
char
clas[10];
int rno;
int age;
};
void main()
{
student s[10];
int i,n;
clrscr();
printf("How Many Records : ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("\nEnter %d
Records\n",i+1);
printf("\nEnter Name Of
Student : ");
scanf("%s",s[i].name);
printf("\nEnter Class Of Student
: ");
scanf("%s",s[i].clas);
printf("\nEnter Roll No : ");
scanf("%d",&s[i].rno);
printf("\nEnter Age Of
Student : ");
scanf("%d",&s[i].age);
}
printf("\n=============================\n");
printf("Name Class RollNo Age\n");
printf("\n=============================\n");
for(i=0;i<n;i++)
{
printf("%s",s[i].name);
printf("\t%s",s[i].clas);
printf("\t%d",s[i].rno);
printf("\t%d",s[i].age);
printf("\n");
}
printf("\n=============================\n");
getch();
}
Output :
How
Many Records : 2
Enter
1 Records
Enter
Name Of Student : Dharm
Enter
Class Of Student : MCA
Enter
Roll No : 935
Enter
Age Of Student : 21
Enter
2 Records
Enter
Name Of Student : Happy
Enter
Class Of Student : MCA
Enter
Roll No : 977
Enter
Age Of Student : 21
=============================
Name Class
RollNo Age
=============================
Dharm MCA
935 21
Happy MCA
977 21
=============================
// Program To Demonstrate Passing
Array Of Structure To Functions
#include<stdio.h>
#include<conio.h>
struct student
{
char name[10];
char
clas[10];
int rno;
int age;
};
student
get(student[],int);
student
show(student[],int);
int i;
void main()
{
student s[10],s2[10];
int i,n;
clrscr();
printf("How Many Records : ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
s2[i]=get(s,i);
}
printf("\n=============================\n");
printf("Name Class RollNo Age\n");
printf("\n=============================\n");
for(i=0;i<n;i++)
{
s2[i]=show(s,i);
}
printf("\n=============================\n");
getch();
}
student get(student
s[10],int i)
{
printf("\nEnter %d
Records\n",i+1);
printf("\nEnter Name Of Student : ");
scanf("%s",s[i].name);
printf("\nEnter Class Of Student :
");
scanf("%s",s[i].clas);
printf("\nEnter Roll No : ");
scanf("%d",&s[i].rno);
printf("\nEnter Age Of Student : ");
scanf("%d",&s[i].age);
return(s[i]);
}
student
show(student s[10],int i)
{
printf("%s",s[i].name);
printf("\t%s",s[i].clas);
printf("\t%d",s[i].rno);
printf("\t%d",s[i].age);
printf("\n\n");
return(s[i]);
}
Output :
How Many
Records : 1
Enter 1 Records
Enter Name Of
Student : Dharminder
Enter Class Of
Student : MCA
Enter Roll No : 935
Enter Age Of
Student : 21
================================
Name Class RollNo
Age
================================
Dharminder MCA 935
21
================================
// Program To Demonstrate Passing
Structure By Value To Functions
#include<stdio.h>
#include<conio.h>
struct student
{
char
name[10];
char
clas[10];
int rno;
int age;
};
student
show(student);
void main()
{
student
s1,s2={"Dharm","MCA",935,21};
s1=show(s2);
printf("\n=============================\n");
printf("Name Class RollNo Age\n");
printf("\n=============================\n");
printf("%s",s1.name);
printf("\t%s",s1.clas);
printf("\t%d",s1.rno);
printf("\t%d",s1.age);
printf("\n=============================\n");
}
student
show(student s2)
{
printf("Enter Name Of Student : ");
scanf("%s",s2.name);
printf("Enter Class Of Student :
");
scanf("%s",s2.clas);
printf("Enter Roll No : ");
scanf("%d",&s2.rno);
printf("Enter Age Of Student : ");
scanf("%d",&s2.age);
return(s2);
}
Output :
Enter
Name Of Student : Dharminder
Enter
Class Of Student : MCA
Enter
Roll No : 935
Enter
Age Of Student : 21
===============================
Name Class RollNo
Age
===============================
Dharminder
MCA 935 21
===============================
// Program To Demonstrate
Structure To Pointer
#include<stdio.h>
#include<conio.h>
struct student
{
char
name[10];
char
clas[10];
int rno;
int age;
};
void main()
{
student *s[10];
int i,n;
clrscr();
printf("How Many Records : ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("\nEnter %d
Records\n",i+1);
printf("\nEnter Name Of
Student : ");
scanf("%s",s[i]->name);
printf("\nEnter Class Of Student
: ");
scanf("%s",s[i]->clas);
printf("\nEnter Roll No : ");
scanf("%d",&s[i]->rno);
printf("\nEnter Age Of Student : ");
scanf("%d",&s[i]->age);
}
printf("\n=============================\n");
printf("Name Class RollNo Age\n");
printf("\n=============================\n");
for(i=0;i<n;i++)
{
printf("%s",s[i]->name);
printf("\t%s",s[i]->clas);
printf("\t%d",s[i]->rno);
printf("\t%d",s[i]->age);
printf("\n");
}
printf("\n=============================\n");
getch();
}
Output :
How
Many Records : 1
Enter
1 Records
Enter
Name Of Student : Dharminder
Enter
Class Of Student : MCA
Enter
Roll No : 935
Enter
Age Of Student : 21
==============================
Name Class RollNo
Age
==============================
Dharminder
MCA 935
21
==============================
Union
// Program To Demonstrate Unions
#include<stdio.h>
#include<conio.h>
union a
{
int i;
char ch[2];
};
void main()
{
union a
key;
clrscr();
key.i=512;
printf("\nkey.i = %d",key.i);
printf("\nkey.ch[0] =
%d",key.ch[0]);
printf("\nkey.ch[1] =
%d",key.ch[1]);
key.ch[0]=50;
printf("\nkey.i = %d",key);
printf("\nkey.ch[0] =
%d",key.ch[0]);
printf("\nkey.ch[1] =
%d",key.ch[1]);
getch();
}
Output :
key.i = 512
key.ch[0] = 0
key.ch[1] = 2
key.i = 562
key.ch[0] = 50
key.ch[1] = 2
// Program To Demonstrate
Stucture & Union
#include<stdio.h>
#include<conio.h>
void main()
{
struct a
{
int i;
char
c[2];
};
struct b
{
int j;
char
d[2];
};
union z
{
struct
a key;
struct
b data;
};
union z
str;
str.key.i=512;
str.data.d[0]=0;
str.data.d[1]=32;
printf("\n%d",str.key.i);
printf("\n%d",str.data.j);
printf("\n%d",str.key.c[0]);
printf("\n%d",str.data.d[0]);
printf("\n%d",str.key.c[1]);
printf("\n%d",str.data.d[1]);
getch();
}
Output :
512
512
0
0
32
32
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