Question

我在主文件中发现了这个问题：

#import <Foundation/Foundation.h>
#import "Person.h"

int main (int argc, const char * argv[])
{

    // Create an instance of Person
    Person *person = [[Person alloc]init];

    // Give the instance variables interesting values
    [person setWeightInKilos:96];
    [person setHeightInMeters:1.8];

    // Call the body mass index
    float bmi = [person bodyMassIndex];
    NSLog(@"person has a bmi of %f", bmi);

    }
    return 0;                           // Expected identifier or '('
 }                                       // Expected external declaration

Person.h

#import <Foundation/Foundation.h>

@interface Person : NSObject {
    float heightInMeters;
    int weightInKilos;
}

// You will be able to set those instance variables using these methods
- (void)setHeightInMeters:(float)h;
- (void)setWeightInKilos:(int)w;

// This method calculates the body weight index
- (float)bodyMassIndex;

@end

Person.m

#import "Person.h"

@implementation Person

- (void)setHeightInMeters:(float)h{
    heightInMeters = h;  
}

- (void)setWeightInKilos:(int)w {
    weightInKilos = w;
}

- (float)bodyMassIndex {
    return weightInKilos / (heightInMeters * heightInMeters);  
}

@end

Answer 1

}之前，您的计划中有一个迷路return 0;。该错误颇具误导性。您可能希望切换到使用LLVM而不是GCC（这样可以加快编译速度，而不仅仅是更好的错误）。

Answer 2

主要功能底部有一个额外的近距离支撑。正好在“返回0”之上线。

Answer 3

在主要功能返回之前，结束括号是做什么的？我认为你关闭了1对多。

预期的标识符或'（'缺失

3 个答案: