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Union in C Programming

Updated: 2026-07-05

Introduction

Union in C Programming is a complete beginner-friendly tutorial on Union in C. It is designed for BTech, diploma, viva, practical exams and placement preparation.

Definition

Union in C is an important concept of C programming that helps students understand programming logic, syntax, memory and problem solving.

Real Life Example

Real-life example: A C program works like a recipe. Each statement gives one clear instruction to the computer.

C Program Example

Copy#include <stdio.h>

int main(){
    printf("Welcome to C Programming");
    return 0;
}

Output

Sample output will appear according to the program and input.

Viva Questions

1. Define Union in C.
2. Give one example of Union in C.
3. What are common mistakes in Union in C?

MCQs

1. Union in C belongs to which programming language? Answer: C Programming
2. Which function is the entry point of a C program? Answer: main()