/*
实际一个学生类Student，有属性：name,age,score,classNum
1.将如下学生添加到数组中
姓名 年龄 分数 班级
Tom 17 82 Class01
Jim 22 75 Class01
Jerry 34 54 Class01
Owen 22 98 Class04
Steve 19 77 Class05
2.计算所有学生的平均分 (年级的平均分)
3.用名字作为key，value是学生对象，将这些学生存入字典
4.计算各个班级的平均分
*/
Student.h
//设置属性
@property(nonatomic,copy)NSString *name;
@property(nonatomic,assign)NSInteger age;
@property(nonatomic,assign)float score;
@property(nonatomic,copy)NSString *classNum;
- (instancetype)initWithName:(NSString *)name withAge:(NSInteger)age withScore:(float)score withClassNum:(NSString *)classNum;
Student.m
- (instancetype)initWithName:(NSString *)name withAge:(NSInteger)age withScore:(float)score withClassNum:(NSString *)classNum
{
if (self = [super init])
{
_name = name;
_age = age;
_score = score;
-classNum = classNum;
}
return self;
}
main.m
//1.
Student *tom = [[Student alloc]initWithName:@"Tom" withAge:17 withScore:82 withClassNum:@"Class01"];
//......分别设置5个学生信息
NSArray *array = @[tom,jim,jerry,owen,seve];
//2.
float sum = 0;
for (Student *stu in array)
{
sum += stu.score;
}
NSLog(@"总分为 %f",sum);
NSLog(@"平均分为%f",sum/[array count]);
//3.
NSDictionary *dic = @{
@"tom":tom,
//分别放入......
}
//4.
float class1sum = 0;//一班的总分
NSInteger class1count = 0;//一班的人数
// 。。。。。。
//遍历学生 数组
for (int i = 0;i < [array count];i++)
{
Student *stu = [array objectAtIndex:i];
//计算2班的 人数和总分
if([stu.classNum isEqualToString:@"Class01"])
{
class1count ++;
class1sum += sut.score;
}
//计算4班的 人数和总分
// ......
}
NSLog(@"一班平均分为%f",class1sum/class1count);
