lvalue required as left operand of assignment

Question

i am trying to make a program which calculates the geometrical average.But i get this error mesage: lvalue required as left operand of assignment

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Answer 1

It is rather a mathematical problem than a programming problem. If you know that

average*average = number1*number1+number2*number2

you must evaluate average first. Solution is

average = sqrt(number1*number1+number2*number2)

EDIT1: but geometric mean should be computed as

average = sqrt(number1 * number2)

according to http://en.wikipedia.org/wiki/Geometric_mean