Programming Example
Basic programming of Union
Basic programming of Union
#include<stdio.h>
#include<string.h>
union student
{
char name[20];
char subject[20];
float percentage;
};
int main()
{
union student record1;
union student record2;
// assigning values to record1 union variable
strcpy(record1.name, "Raju");
strcpy(record1.subject, "Maths");
record1.percentage = 86.50;
printf("Union record1 values example\n");
printf(" Name : %s \n", record1.name);
printf(" Subject : %s \n", record1.subject);
printf(" Percentage : %f \n\n", record1.percentage);
// assigning values to record2 union variable
printf("Union record2 values example\n");
strcpy(record2.name, "Mani");
printf(" Name : %s \n", record2.name);
strcpy(record2.subject, "Physics");
printf(" Subject : %s \n", record2.subject);
record2.percentage = 99.50;
printf(" Percentage : %f \n", record2.percentage);
return 0;
} Union record1 values example
Name :
Subject :
Percentage : 86.500000
Union record2 values example
Name : Mani
Subject : Physics
Percentage : 99.500000
Press any key to continue . . .
A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose.
Unions are quite similar to structures in C. Like structures, unions are also derived types.
union car
{
char name[50];
int price;
};
Defining a union is as easy as replacing the keyword struct with the keyword union.
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.