Q91 What is union in C? Where we use union? July 19, 2015 Gyantoday Most Important Interview Questions In C Leave a comment Share this: RelatedHello Friends !!!!!May 27, 2015In "Most Important Interview Questions In C"Q9. Write a C program to swap two variables without using any temporary variable.June 4, 2015In "Most Important Interview Questions In C"Q90 What is bit field in C?July 19, 2015In "Most Important Interview Questions In C"