Can anyone please explain the logic (a+=b=b-=c=c*=d/=20) ?

Question

public class Program
{
public static void main(String[] args) {
int a,b,c,d;
a=b=c=d=20;
a+=b=b-=c=c*=d/=20;
System.out.print(a+" "+b+" "+c+" "+d+" ");
//Output -> 20 0 20 1
}
}

Answer 1

Kiruthik Kumar BCA evaluate from right to left, since they are all assignment statements.

All variables are initialized to the same value of 20.
d/=20 divides d/20 and assigns 1 to d
c*=d multiplies c*1 and stores 20 in c
c=c no change
b-=c subtracts b-20 and stores 0 in b
b=b no change
a+=b adds a+0 and stores 20 in a

By this analysis you can see why it outputs
20 0 20 1

Answer 2

Kiruthik Kumar BCA

d or d/20 is 20/20 = 1
c or c * 1 = 20
b or b-=20 is 20 minus 20 = 0
a or a+=0 is 20 + 0 = 20

Answer 3

a=b=c=d=20;
a=20;b=20;c=20;d=20;
-----------

d=d/20=1
c=c*d=20
b=b-c=0
a=a+b=20
a+=b=b-=c=c*=d/=20;
Read from right to left ..
System.out.print(a+" "+b+" "+c+" "+d+" ");
//Output -> 20 0 20 1

Answer 4

Thanks BroFar , Brian , Smith Welder 😊

Answer 5

a+= 20+0 = 20
b-= 20-20 = 0
c*1= 20
d/20 = 20/20 = 1

# 20 0 20 1 #