Write a C program that finds the sum of diagonal elements of a mxn

matrix.

Write a program to calculate sum of first $50$ natural numbers using

recursive function.

Define a function named fact to calculate factorial of a number n $.$

Write a recursive function to generate Fibonacci series.

Write a program that illustrates use of local, global and static

variables

Write a program to find biggest among three numbers using pointer

Write a program to swap value of two variables using pointer.

Write a program to copy one string to another string with and without

using string handling function.

Write a program to concatenate, compare two strings and also find the

length of string.

Create a structure named company which has name, address, phone

and no of Employee as member variables. Read name of company, its

address, phone and no of Employee. Finally display these members'

value.

$25.$ Write a program to show programming examples with union.