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import java.math.*;
class LongTest{
public static void main(String []args){
long a = 5;
long b = 10;
BigDecimal x = BigDecimal.valueOf(a + b);
BigDecimal d = BigDecimal.valueOf(a).divide(x, new MathContext(2));
System.out.println("a / (a + b) = " + d);
}
}
import java.text.DecimalFormat;
public class Test01 {
public static void main(String[] args) {
long a = 5;
long b = 10;
double percent = (double)a / (a + b);
DecimalFormat format = new DecimalFormat("0.00%");
String result = format.format(percent);
System.out.println(result);
}
}