Union Sample Program in C

While I am writing my book in C programming I just learned for the first time how to write a program using Union in C. Here is a very simple program to demonstrate how to use union works.

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Program Listing

#include <stdio.h>

union student

{

   char name[200],subject[200];

   int age;

   float grade;

};

int main()

{

 union student records;

 printf("\n\n");

 printf("\tUnion Sample Program");

 printf("\n\n");

 printf("\t===== DISPLAY RECORD =====");

 printf("\n\n");

 strcpy(records.name,"Juan Dela Cruz");

 printf("\tStudent Name    :  %s\n ",records.name);

 records.age = 17;

 printf("\tStudent Age     :  %d\n ",records.age);

 strcpy(records.subject,"Linear Algebra");

 printf("\tStudent Subject :  %s\n ",records.subject);

 records.grade =89.03;

 printf("\tStudent Grade   :  %.2f\n ",records.grade);

 printf("\n");

 printf("\tEnd of Program");

 printf("\n\n");

}