OC三大特性之封装

/*
 4.设计一个成绩类
 * C语言成绩（可读可写）
 * OC成绩（可读可写）
 * 总分（只读）
 * 平均分（只读）
*/
#import <Foundation/Foundation.h>

@interface Score : NSObject
{
    int _cScore; // C语言成绩
    int _ocScore; // OC成绩
    
    int _totalScore;// 总分
    int _averageScoe; // 平均分
}

- (void)setCScore:(int)cScore;
- (int)cScore;

- (void)setOcScore:(int)ocScore;
- (int)ocScore;

- (int)totalScore;
- (int)averageScore;

@end

@implementation Score
- (void)setCScore:(int)cScore
{
    _cScore = cScore;
    
    // 计算总分
    _totalScore = _cScore + _ocScore;
    _averageScoe = _totalScore/2;
}
- (int)cScore
{
    return _cScore;
}

- (void)setOcScore:(int)ocScore
{
    _ocScore = ocScore;
    
    // 计算总分
    _totalScore = _cScore + _ocScore;
    _averageScoe = _totalScore/2;
}
// 监听成员变量的改变

- (int)ocScore
{
    return _ocScore;
}

- (int)totalScore
{
    return _totalScore;
}
- (int)averageScore
{
    return _averageScoe;
}
@end


int main()
{
    Score *s = [Score new];
    
    [s setCScore:90];
    [s setOcScore:100];
    
    [s setCScore:80];
    
    
    int a = [s totalScore];
    
    NSLog(@"总分：%d", a);
    
    return 0;
}