preset counter variable in a for loop

Namal sotis22 at mail.ru
Fri Feb 28 13:16:43 UTC 2020


On Friday, 28 February 2020 at 12:48:17 UTC, mipri wrote:
> 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++){

Thanks, I didn't know that you don't need it there and can leave 
it out!



More information about the Digitalmars-d-learn mailing list