int x=1,m=0; for(;m<10;++m) x=x+x; System.out.print(x);

Question

Explain

Answer 1

You can see what's going on in the loop by adding some print works to see how <x> changes with each loop iteration.

int x = 1, m = 0;
for (; m < 10; ++m)
{
System.out.printf("In loop x = %d\n", x);
x = x + x;
}
System.out.printf("Finally ... x is %d", x);

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Answer 2

it's a loop, explained enough on course too, you can learn here
https://www.sololearn.com/learn/Java/2147/