在线等，这个JAVA程序为什么是这样的结果

public class ValueOfDemo {
public static void main(String[] args) {

//this program requires two arguments on the command line
if (args.length == 2) {

//convert strings to numbers
float a = Float.valueOf(args[0]).floatValue();
float b = Float.valueOf(args[1]).floatValue();

//do some arithmetic
System.out.println("a + b = " + (a + b) );
System.out.println("a - b = " + (a - b) );
System.out.println("a * b = " + (a * b) );
System.out.println("a / b = " + (a / b) );
System.out.println("a % b = " + (a % b) );
} else {
System.out.println("This program requires two command-line arguments.");
}
}
}
结果：
a + b = 91.7
a - b = -82.7
a * b = 392.4