Cleaned Code

MathPad/MPPowerFunction.m

@@ -35,6 +35,10 @@ MPFunctionAccessorImplementation(ExponentExpression, _exponentExpression)
 {
     NSDecimalNumber *base = [self.baseValue evaluate];
     NSDecimalNumber *exponent = [[self.exponentExpression parse] evaluate];
+    if ([base isEqualToNumber:@(0)] && [exponent isEqualToNumber:@(0)]) {
+        // The C pow function returns 1 for pow(0, 0). Mathematically this should be undefined.
+        return [NSDecimalNumber notANumber];
+    }
     return [[NSDecimalNumber alloc] initWithDouble:pow(base.doubleValue, exponent.doubleValue)];
 }