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

Answer 2

Use this formula to calculate Geometric average:

Geometric average = square root of (number1 * number2)

#include<stdio.h>
#include<math.h>

int main()
{

    float number1,number2,average;

    printf("enter the numbers which you want to calculate geometrical average of them > ");
    scanf("%f %f",&number1,&number2);

    average=sqrt(number1*number2);

    printf("Geometrical average is:%f",average);

    return 0;
}