Reorganized File Structure

Added Documentation

MathKit/MPFractionTerm.m

@@ -0,0 +1,31 @@
+//
+//  MPFractionTerm.m
+//  MathPad
+//
+//  Created by Kim Wittenburg on 15.11.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPFractionTerm.h"
+
+#import "MPParsedExpression.h"
+
+@implementation MPFractionTerm
+
+- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
+{
+    MPEvaluateExpression(nominator, 0);
+    MPEvaluateExpression(denominator, 1);
+    if ([denominator isEqualToNumber:@0]) {
+        if (error) {
+            *error = [NSError errorWithDomain:MPMathKitErrorDomain
+                                         code:100
+                                     userInfo:@{NSLocalizedDescriptionKey: NSLocalizedString(@"Division by zero.", nil)}];
+        }
+        return nil;
+    } else {
+        return [nominator decimalNumberByDividingBy:denominator];
+    }
+}
+
+@end