wehub-resource-sync
48 lines
981 B
Objective-C
48 lines
981 B
Objective-C
#import <Foundation/Foundation.h>
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#import "Logger.h"
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@interface Calculator : NSObject
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@property(nonatomic) NSInteger result;
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- (NSInteger)add:(NSInteger)a to:(NSInteger)b;
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- (void)reset;
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+ (Calculator *)sharedCalculator;
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@end
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@implementation Calculator
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- (NSInteger)add:(NSInteger)a to:(NSInteger)b {
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NSInteger sum = a + b;
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self.result = sum;
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[self logResult:sum];
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return sum;
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}
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- (void)reset {
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self.result = 0;
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NSLog(@"Calculator reset");
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}
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- (void)logResult:(NSInteger)value {
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NSLog(@"Result: %ld", (long)value);
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}
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+ (Calculator *)sharedCalculator {
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static Calculator *instance = nil;
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if (instance == nil) {
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instance = [[Calculator alloc] init];
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}
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return instance;
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}
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@end
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int main(int argc, const char * argv[]) {
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@autoreleasepool {
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Calculator *calc = [Calculator sharedCalculator];
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NSInteger r = [calc add:3 to:4];
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[calc reset];
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NSLog(@"Final: %ld", (long)r);
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}
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return 0;
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}
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