17. Write an object-oriented program in C++ to read a set of lines and find out the number of characters, words, and lines in a given text using static member class.
18. Write an object-oriented program in C++ to read a line and find out the number of vowels (a, e, i, o,
u) and consonants present in the given line using static member functions.
19. Write an object-oriented program to perform trigonometric operations on complex numbers using a friend function.
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