Re: preset counter variable in a for loop

[mipri via Digitalmars-d-learn]

On Friday, 28 February 2020 at 12:44:52 UTC, Namal wrote:

Hello,

I don't understand why this simple code causes a compiler error..

import std.stdio;

void main(){

 int b = 0;

 for (b; b<3; b++){
   writeln(b);          
 }
}

$Error: b has no effect

Well, that's the error. b has no effect, so there's
no need for it, and it's likely written in error. It
has no effect in C++ either, and you may get a warning:

example.cc: In function 'int main()':
example.cc:7:8: warning: statement has no effect [-Wunused-value]
  for (b; b<3; b++){