Question

hi guys am kinda new to the language i made this simple program about Fibonacci
and the program works fine but there is strange behavior when i try to get the average number

public class fibonacci {

/**
 * @param args
 */
public static int fibonaccifun(int number)

{
    int firstvar=1;
    int secondvar=0,total=0,sum=0;
    for(int i=0;i<number;i++)
    {
        total =firstvar+secondvar;
        System.out.println(total);
        firstvar=secondvar;
        secondvar=total;
        sum+=total;

    }

return sum;
}

public static void main(String[] args) {
    // TODO Auto-generated method stub



     float aver= (float) ( fibonacci.fibonaccifun(5)/5);
    System.out.println(aver);

………………………………

when i try

float aver= (float) ( fibonacci.fibonaccifun(5))/5; the result is 2.4 which is the correct value ,however when i do this

float aver= ((float) fibonacci.fibonaccifun(5)/5); the average =2.0;

i dont know why it do this so can anyone helps me explaining this ,thx guys.

Answer 1

because in the second case

fibonacci.fibonaccifun(5)/5

goes to 2, as both the result of fibonaccifun and 5 are ints, THEN you cast to float. (If you divide 2 ints, the result is an int, and ints obviously can’t have decimals)

In the first case

(float) ( fibonacci.fibonaccifun(5))

makes the result of fibonaccifun a float, THEN you do the division.