求助，这个程序编译没有任何问题，运行提示Segmentation fault: 11 - 黑马程序员技术交流社区

#import<Foundation/Foundation.h>
/*********************成绩类************************/
@interface Score : NSObject
{
@public
int cScore; // 定义C语言成绩 OC和iOS成绩
int ocScore;
int iosScore;
}
- (int)compareCScoreWithOther:(Score *)other; // 和其他人比较C成绩，OC成绩和iOS成绩
- (int)compareOcScoreWithOther:(Score *)other;
- (int)compareIosScoreWithOther:(Score *)other;
- (int)totalSum;
- (int)averageScore;
@end
@implementation Score
- (int)compareCScoreWithOther:(Score *)other // 比较成绩的方法实现
{
return cScore-other->cScore;
}
- (int)compareOcScoreWithOther:(Score *)other
{
return ocScore-other->ocScore;
}
- (int)compareIosScoreWithOther:(Score *)other
{
return iosScore-other->iosScore;
}
- (int)totalSum
{
return cScore+ocScore+iosScore;
}
- (int)averageScore
{
return (cScore+ocScore+iosScore)/3;
}
@end
/*********************学生类**************************/
@interface Student : NSObject
{
@public
char *name;
int no;
Score *score; // 学生成绩，引用上面的score类
}
- (int)compareCScoreWithOther:(Student *)other;
- (int)compareOcScoreWithOther:(Student *)other;
- (int)compareIosScoreWithOther:(Student *)other;
- (int)totalSum:(Student *)other;
- (int)averageScore:(Student *)other;
@end
@implementation Student // 学生比较成绩实现方法
- (int)compareCScoreWithOther:(Student *)other
{
return [score compareCScoreWithOther:other->score];
}
- (int)compareOcScoreWithOther:(Student *)other
{
return [score compareOcScoreWithOther:other->score];
}
- (int)compareIosScoreWithOther:(Student *)other
{
return [score compareIosScoreWithOther:other->score];
}
- (int)totalSum:(Student *)other
{
return [score totalSum]-[other->score totalSum];
}
- (int)averageScore:(Student *)other
{
return [score averageScore]-[other->score averageScore];
}
@end
int main()
{
Student *stu = [Student new];
stu->score->cScore = 35;
stu->score->ocScore = 84;
stu->score->iosScore = 81;
Student *stu2 = [Student new];
stu2->score->cScore = 39;
stu2->score->ocScore = 91;
stu2->score->iosScore = 39;
int a = [stu compareCScoreWithOther : stu2];
int b = [stu compareOcScoreWithOther : stu2];
int c = [stu compareIosScoreWithOther : stu2];
int d = [stu totalSum :stu2];
int e = [stu averageScore :stu2];
NSLog(@"compareCScoreWithOther = %d,compareOcScoreWithOther = %d,compareIosScoreWithOther = %d,totalSum = %d,averageSum = %d",a,b,c,d,e);
return 0;
}

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