CareerCup

double payment = 0.1;
double sum = 0.0;

for (int i=0; i<10; i++)
{
sum += payment;
}

why is output 0.9999999999999999


public class TestFloatingPoint {
public static void main(String[] args) {
double payment = 0.125;
double sum = 0.0;

for (int i=0; i<8; i++) {
sum += payment;
}
System.out.println(sum);
}
}

Why does this give 1.0