public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
System.out.println("three=one+two==>"+(three=one+two));
System.out.println("three+=one==>"+(three+=one));
System.out.println("three-=one==>"+(three-=one));
System.out.println("three*=one==>"+(three*=one));
System.out.println("three=/=one==>"+(three/=one));
//下划线里面的123(加号后面的)分别代表哪些数字?还是int里面的值么?
}
}
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