退出代码1失败

Question

  

Command / Applications / Xcode.app / Contents / Developer / Toolchains / XcodeDefault.xctoolchain / usr / bin / clang失败，退出代码为1

当我尝试运行这些文件时，我收到的错误就像上面那样。

我创建了BNRStockHolding.h和BNRStockHolding.m

这是.h文件     #import

@interface BNRStockHolding : NSObject
//getter and setter
@property (nonatomic, readwrite) float purchaseSharePrice;
@property (nonatomic, readwrite) float currentSharePrice;
@property (nonatomic, readwrite) int numberOfShares;
//method involving calculation
-(float)costInDollars;
-(float)valueInDollars;
@end

这是.m文件

#import "BNRStockHolding.h"

@implementation BNRStockHolding
-(float)costInDollars{
    float total=([self purchaseSharePrice]*[self numberOfShares]);
    return total;

}

-(float)valueInDollars{
    float currenttotal=([self currentSharePrice]*[self numberOfShares]);
    return currenttotal;
}
@end

这是代码文件

#import <Foundation/Foundation.h>
#import "BNRStockHolding.h"
#import "BNRStockHolding.m"
int main(int argc, const char * argv[])
{

    @autoreleasepool {
   //Creating instsances of BNRStockHolding to be stored in an array later
        BNRStockHolding *a=[[BNRStockHolding alloc]init];
        BNRStockHolding *b=[[BNRStockHolding alloc]init];
        BNRStockHolding *c=[[BNRStockHolding alloc]init];

    //Storing value of a here
        a.purchaseSharePrice=2.30;
        a.currentSharePrice=4.50;
        a.numberOfShares=40;
    //Storing value of b here
        b.purchaseSharePrice=12.19;
        b.currentSharePrice=10.56;
        b.numberOfShares=90;
    //Storing value of c here
        c.purchaseSharePrice=45.10;
        c.currentSharePrice=49.51;
        c.numberOfShares=210;
    //Creating an instance of NSArray class
        NSMutableArray *stockptr=[NSMutableArray array];
    //Add instances into the mutable array
        [stockptr addObject:a];
        [stockptr addObject:b];
        [stockptr addObject:c];

    //printing value
        for (BNRStockHolding* ptr in stockptr){
            NSLog(@"1 is %f, 2 is %f, 3 is    %d,%f,%f",ptr.purchaseSharePrice,ptr.currentSharePrice,ptr.numberOfShares, [ptr costInDollars],[ptr valueInDollars] );
        }
    }
    return 0;
}

此外，我将.m和.h文件存储在存储main.m文件的文件夹中。我应该在main.m文件上面存储.m和.h一个文件夹吗？希望有人可以帮我解决这个问题。