37 lines
1.1 KiB
Objective-C
37 lines
1.1 KiB
Objective-C
//
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// MPPowerTerm.m
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// MathPad
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//
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// Created by Kim Wittenburg on 15.11.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPPowerTerm.h"
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#import "MPParsedExpression.h"
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@implementation MPPowerTerm
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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NSDecimalNumber *exponent = [[self expressionAtIndex:0] evaluate:error];
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if (!exponent) {
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return nil;
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}
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NSDecimalNumber *base = [self.baseTerm evaluate:error];
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if (!base) {
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return nil;
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}
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if ([base isEqualToNumber:@(0)] && [exponent isEqualToNumber:@(0)]) {
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// The C pow function returns 1 for pow(0, 0). Mathematically this should be undefined.
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if (error) {
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*error = [NSError errorWithDomain:MPMathKitErrorDomain
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code:101
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userInfo:@{NSLocalizedDescriptionKey: NSLocalizedString(@"0 to the power of 0 is undefined.", nil)}];
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}
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return nil;
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}
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return [[NSDecimalNumber alloc] initWithDouble:pow(base.doubleValue, exponent.doubleValue)];
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}
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@end
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