A simple program to demonstrate how to declare and use union in C programming language.

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Program Listing

/* unio.c
   Author : Professor Jake Rodriguez Pomperada, MAED-IT, MIT
   www.jakerpomperada.blogspot.com  and  www.jakerpomperada.com 
   Bacolod City, Negros Occidental Philippines.

#include <stdio.h>

union student
   char name[200],subject[200];
   int age;
   float grade;

int main()
 union student records;
 printf("\tUnion Sample Program in C");
 printf("\t===== DISPLAY RECORD =====");
 strcpy(records.name,"Jacob Samuel F. Pomperada");
 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("\tEnd of Program");