i\'m no noob when it come to programming but this is the first time ive run into this issue. I w2as testing a program that is incrementing by a certain value to gather intervals for simpson\'s rule. When the values are not of 1 / 2^x increments it gets weird

simplified version of the code with .2 as the increment:

public class test{
public static void main(String[] args) {
double a = 1, b = 5, h = 0.2;
double temp = a;

while (temp <= b){
System.out.println(temp);
temp += h;
}

}
}

the output:

1.0
1.2
1.4
1.5999999999999999
1.7999999999999998
1.9999999999999998
2.1999999999999997
2.4
2.6
2.8000000000000003
3.0000000000000004
3.2000000000000006
3.400000000000001
3.600000000000001
3.800000000000001
4.000000000000001
4.200000000000001
4.400000000000001
4.600000000000001
4.800000000000002

can anyone explain why this is happening, i have used both jGrasp and Eclipse and both have given me this, so its not an issue of IDE
EDIT: i do know the whole number limitation thing, 0.20 is not like .3333, nor is .10 so i dont see why it would happen this way