What does “Comparing constant with boolean expression is always true” warning mean?

Question

What does this warning mean (i and j are not constants):

I have been trying to Google this but it does not give me any results.

Answer 1

The other answers have already explained the core problem. You can use:

if ( ( ( 0 <= i) && (i <= 10)) && ( ( 0 <= i) && (i <= 10)) ) 

to resolve your problem.

My recommendation will be to wrap that logic in a function.

int isInRange(int x, int lower, int upper)
{
   return (lower <= x && x <= upper);
}

and use

if ( isInRange(i, 0, 10) && isInRange(j, 0, 10) )