对于以下代码，
-Objective-C 怎么知道在复数上加一个“i”？当我在 Complex.m 文件中将“实数”和“虚数”定义为双精度值时，我认为 Xcode 只会知道“实数”和“虚数”是双精度值。
- 如果我在 main.m 文件中的复数末尾添加“i”，例如，如果我打开“myComplex.imaginary = 7;” 进入“myComplex.imaginary = 7i;” 该行的输出变为 0.00000i，如果我添加任何其他字母，程序将根本无法运行，这是为什么呢？
基本上，在我看来，Xcode 已经知道“真实”和“想象”的含义，我正在关注的书没有具体说明这一点，所以我有点困惑。
另外，我应该注意，我没有创建以下代码，因为我自己无法找出问题所在，此代码是从我的图书论坛的成员那里复制的。
// Complex.h
#include <Foundation/Foundation.h>
@interface Complex : NSObject
@property double real, imaginary;
-(void) print;
-(Complex *) add: (Complex *) complexNum;
-(Complex *) subtract: (Complex *) complexNum;
-(Complex *) multiply: (Complex *) complexNum;
-(Complex *) divide: (Complex *) complexNum;
@end
// Complex.m
#import "Complex.h"
@implementation Complex
@synthesize real, imaginary;
-(void) print
{
NSLog(@"%f + %fi", real, imaginary);
}
-(Complex *) add: (Complex *) complexNum
{
Complex *result = [[Complex alloc]init];
result.real = real + complexNum.real;
result.imaginary = imaginary + complexNum.imaginary;
return result;
}
-(Complex *) subtract: (Complex *) complexNum
{
Complex *result = [[Complex alloc]init];
result.real = real - complexNum.real;
result.imaginary = imaginary - complexNum.imaginary;
return result;
}
-(Complex *) multiply: (Complex *) complexNum
{
Complex *result = [[Complex alloc]init];
result.real = real * complexNum.real;
result.imaginary = imaginary * complexNum.imaginary;
return result;
}
-(Complex *) divide: (Complex *) complexNum
{
Complex *result = [[Complex alloc]init];
result.real = real / complexNum.real;
result.imaginary = imaginary / complexNum.imaginary;
return result;
}
@end
//
// main.m
// Complex
#include <Foundation/Foundation.h>
#import "Complex.h"
int main(int argc, const char *argv[]) {
@autoreleasepool {
Complex *myComplex = [[Complex alloc]init];
Complex *totalComplex = [[Complex alloc]init];
Complex *yourComplex = [[Complex alloc]init];
myComplex.real = 5.3;
myComplex.imaginary = 7;
[myComplex print];
NSLog(@"+");
yourComplex.real = 2.7;
yourComplex.imaginary = 4;
[yourComplex print];
NSLog(@"=");
totalComplex = [myComplex add: yourComplex];
[totalComplex print];
}
return 0;
}