With an example, illustrate the concept of extern variable, Basic Computer Science

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Question 1 With an example, illustrate the concept of extern variable

Question 2 What is the difference between pointer variable and simple variable?

Question 3 Give the differences between Structures and Unions with one example

Question 4 Write a program in C to find the root of a quadratic equation

Question 5 Write a program to use structure within union and display the contents of structure elements

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