I'm working on a scaling system, to scale numbers up 25% and round to the nearest integer, and to do this, I am trying to rely on the loss of precision by transferring a double into an int. Is there any way to get around this? or should I go about it in a different way?
public int[] scaleMarks(int[] marks)
{
double scale = 1.25;
double temp1;
int temp2;
for(int i = 0; i < marks.length; i++)
{
temp1 = marks[i] * scale;
temp2 = marks[i] * scale; //***Loss of precision here***
if(temp1-temp2>= 0.5)
{
temp2++;
}
marks[i] = temp2;
}
return marks;
}
您需要使用Math.round
对产品进行舍入,以便可以安全地将其转换为int
。
marks[i] = (int) Math.round(marks[i] * scale);
If you want round-to-nearest, rather than truncation, you need to use Math.round.
public class Test {
public static void main(String[] args) {
System.out.println((int)0.999999);
System.out.println(Math.round(0.999999));
}
}
outputs
0
1
You can use Math.round function to avoid it:
(int)Math.round(marks[i] * scale);
EDIT: You will have to cast it to int
because if you don't do that the result will be wrong (because scale
it's a double
).
I expect it will be helpful for you!
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