Why the output is 20? (for loop)

Question

int a=0, b=20;
for(;a<b;a++);
cout<< a;
Why the result is 20?
Shouldnt it be 01234567...1516171819?
I'm confused plz help

Answer 1

ditch the semicolon at the end of the for loop

Answer 2

Oh you are right!
This question is quite tricky to me. So the semicolon immediately end the loop?
Thanks for answering!!

Answer 3

yes, In C and C++, a semicolon acts as a statement terminator.