44 lines
1.2 KiB
Objective-C
44 lines
1.2 KiB
Objective-C
//
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// MPRootFunction.m
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// MathPad
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//
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// Created by Kim Wittenburg on 22.10.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPRootFunction.h"
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#import "MPExpressionTree.h"
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@implementation MPRootFunction
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MPFunctionAccessorImplementation(ExponentExpression, _exponentExpression)
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MPFunctionAccessorImplementation(RadicantExpression, _radicantExpression)
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- (NSArray *)childrenAccessors
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{
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return @[@"exponentExpression", @"radicantExpression"];
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}
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- (BOOL)validate:(NSError *__autoreleasing *)error
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{
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return [[self.exponentExpression parse] validate:error] && [[self.radicantExpression parse] validate:error];
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}
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- (NSDecimalNumber *)evaluate
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{
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NSDecimalNumber *exponent = [[self.exponentExpression parse] evaluate];
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NSDecimalNumber *radicant = [[self.radicantExpression parse] evaluate];
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return [[NSDecimalNumber alloc] initWithDouble:pow(radicant.doubleValue, exponent.doubleValue)];
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}
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- (NSString *)description
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{
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if (self.exponentExpression == nil) {
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return [NSString stringWithFormat:@"√%@", self.radicantExpression.description];
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}
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return [NSString stringWithFormat:@"pow(%@; %@)", self.radicantExpression.description, self.exponentExpression];
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}
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@end
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