41 lines
1.2 KiB
Objective-C
Executable File
41 lines
1.2 KiB
Objective-C
Executable File
//
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// MPProductFunctionTerm.m
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// MathPad
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//
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// Created by Kim Wittenburg on 10.01.15.
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// Copyright (c) 2015 Kim Wittenburg. All rights reserved.
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//
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#import "MPProductFunctionTerm.h"
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#import "MPParsedExpression.h"
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@implementation MPProductFunctionTerm
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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MPParsedExpression *startExpression = [self expressionAtIndex:0];
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NSDecimalNumber *start = [startExpression evaluate:error];
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ReturnNilIfNil(start);
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MPEvaluateExpression(target, 1);
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MPParsedExpression *sumExpression = [self expressionAtIndex:2];
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NSDecimalNumber *value = [NSDecimalNumber one];
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for (NSDecimalNumber *current = start;
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[current compare:target] <= 0;
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current = [current decimalNumberByAdding:[[NSDecimalNumber alloc] initWithInteger:1]]) {
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if (![self defineVariable:startExpression.definedVariable value:current error:error]) {
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return nil;
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}
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NSDecimalNumber *currentValue = [sumExpression evaluate:error];
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ReturnNilIfNil(currentValue);
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value = [value decimalNumberByMultiplyingBy:currentValue];
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}
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return value;
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}
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@end
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