Objective-C数字 - 芒果文档

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📜 Objective-C数字

📅 最后修改于: 2020-11-03 15:55:09 🧑 作者: Mango

在Objective-C编程语言中，为了以对象形式保存int，float，bool等基本数据类型，

Objective-C提供了使用NSNumber的多种方法，下表列出了重要的方法。

Sr.No.	Method & Description
1	*+ (NSNumber )numberWithBool:(BOOL)value** Creates and returns an NSNumber object containing a given value, treating it as a BOOL.
2	*+ (NSNumber )numberWithChar:(char)value** Creates and returns an NSNumber object containing a given value, treating it as a signed char.
3	*+ (NSNumber )numberWithDouble:(double)value** Creates and returns an NSNumber object containing a given value, treating it as a double.
4	*+ (NSNumber )numberWithFloat:(float)value** Creates and returns an NSNumber object containing a given value, treating it as a float.
5	*+ (NSNumber )numberWithInt:(int)value** Creates and returns an NSNumber object containing a given value, treating it as a signed int.
6	*+ (NSNumber )numberWithInteger:(NSInteger)value** Creates and returns an NSNumber object containing a given value, treating it as an NSInteger.
7	– (BOOL)boolValue Returns the receiver’s value as a BOOL.
8	– (char)charValue Returns the receiver’s value as a char.
9	– (double)doubleValue Returns the receiver’s value as a double.
10	– (float)floatValue Returns the receiver’s value as a float.
11	– (NSInteger)integerValue Returns the receiver’s value as an NSInteger.
12	– (int)intValue Returns the receiver’s value as an int.
13	*– (NSString )stringValue** Returns the receiver’s value as a human-readable string.

这是一个使用NSNumber的简单示例，该代码将两个数字相乘并返回乘积。

现场演示

#import 

@interface SampleClass:NSObject
- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b;
@end

@implementation SampleClass

- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b {
   float number1 = [a floatValue];
   float number2 = [b floatValue];
   float product = number1 * number2;
   NSNumber *result = [NSNumber numberWithFloat:product];
   return result;
}

@end

int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   SampleClass *sampleClass = [[SampleClass alloc]init];
   NSNumber *a = [NSNumber numberWithFloat:10.5];
   NSNumber *b = [NSNumber numberWithFloat:10.0];   
   NSNumber *result = [sampleClass multiplyA:a withB:b];
   NSString *resultString = [result stringValue];
   NSLog(@"The product is %@",resultString);

   [pool drain];
   return 0;
}

现在，当我们编译并运行程序时，我们将得到以下结果。

2013-09-14 18:53:40.575 demo[16787] The product is 105