What is the method for testing whether a double (or integer) is infinity, for example when 1/0 operation is performed? isfinite(n) does not seem to work.

You may check <pre class="prettyprint"><code>if(d == INFINITY) {} </code></pre> or <pre class="prettyprint"><code>if(d > DBL_MAX) {} </code></pre> <code>INFINITY</code> is a constant float expression defined in <code>math.h</code> representing positive infinity; <code>DBL_MAX</code> is a constant defined in <code>float.h</code> representing the largest double that can be represented. Check also here

Check for inf - Objective-C

1 Answers

You may check

if(d == INFINITY) {}

if(d > DBL_MAX) {}

INFINITY is a constant float expression defined in math.h representing positive infinity;
DBL_MAX is a constant defined in float.h representing the largest double that can be represented.

Check also here