黑马程序员——编程实践

------Java培训、Android培训、iOS培训、.Net培训、期待与您交流！ -------

1.创建一个 Dog 类,成员变量有,int age; int weight; int height; 分别写三个 set 函数,给三个成员变量赋值。  再写一个 printInformation 函数,打印三个成员变量的值

设计一个点类MyPoint,横坐标为x,纵坐标为y,分别对x,y进行设置和打印。

#import <Foundation/Foundation.h>@interface MyPoint : NSObject{    double _x;    double _y;}//初始化方法-(id)initWithX:(double)x andY:(double)y;//x的设置方法和获取方法-(void)setX:(double)x;-(double)x;//y的设置方法和获取方法-(void)setY:(double)y;-(double)y;//同时设置x和y的方法-(void)setX:(double)x andY:(double)y;//显示点的值-(void)show;@end#import "MyPoint.h"@implementation MyPoint//初始化方法-(id)initWithX:(double)x andY:(double)y{    if (self=[super init]) {        _x=x;        _y=y;    }    return self;}//x的设置方法和获取方法-(void)setX:(double)x;{    _x=x;}-(double)x;{    return _x;}//y的设置方法和获取方法-(void)setY:(double)y;{    _y=y;}-(double)y;{    return _y;}//同时设置x和y的方法-(void)setX:(double)x andY:(double)y;{    _x=x;    _y=y;}//显示点的值-(void)show;{    NSLog(@"point x=%f,y=%f",_x,_y);}@end#import <Foundation/Foundation.h>#import "MyPoint.h"int main(int argc, const char * argv[]){    @autoreleasepool {                MyPoint *point=[[MyPoint alloc]init];        [point setX:100];        [point setY:200];        [point show];        [point setX:-100 andY:-200];        [point show];                    }    return 0;}

2.设计一个圆类MyCircle,半径为r,创建一个半径为5的圆对象,打印周长和面积。

#import <Foundation/Foundation.h>@interface MyCIrcle : NSObject{    double _r;    double _l;    double _area;}-(void)setR:(double)r; //andL:(double)l andArea:(double)area;-(void)show;@end************************************************************************************************************ #import "MyCIrcle.h"#define PI 3.1415@implementation MyCIrcle-(void)setR:(double)r;{}-(void)show;{    NSLog(@"l=%lf\narea=%lf",_l=2*PI*_r,_area=PI*_r*_r);}@end************************************************************************************************************#import <Foundation/Foundation.h>#import "MyCIrcle.h"#define PI 3.1415int main(int argc, const char * argv[]){    @autoreleasepool {                MyCIrcle *circle=[[MyCIrcle alloc]init];        [circle setR:5];        [circle show];            }    return 0;}************************************************************************************************************方法二#import <Foundation/Foundation.h>@interface MyCIrcle : NSObject{    double _r;    double _l;    double _area;}-(id)initWithR:(double)r;-(void)show;@end************************************************************************************************************#import "MyCIrcle.h"#define PI 3.1415@implementation MyCIrcle-(id)initWithR:(double)r;// andL:(double)l andArea:(double)area;{    if (self=[super init]) {        _r=r;    }    return self;}-(void)show;{    NSLog(@"l=%lf\narea=%lf",_l=2*PI*_r,_area=PI*_r*_r);}@end************************************************************************************************************#import <Foundation/Foundation.h>#import "MyCIrcle.h"#define PI 3.1415int main(int argc, const char * argv[]){    @autoreleasepool {        MyCIrcle *anotherCircle=[[MyCIrcle alloc]initWithR:5];        [anotherCircle show];            }    return 0;}************************************************************************************************************方法三#import <Foundation/Foundation.h>@interface MyCIrcle : NSObject{    double _r;    double _l;    double _area;}-(void)setR:(double)r;-(double)r;-(void)show;@end************************************************************************************************************#import "MyCIrcle.h"#define PI 3.1415@implementation MyCIrcle-(void)setR:(double)r;{    _r=r;}-(double)r;{    return _r;}-(void)show;{    NSLog(@"l=%lf\narea=%lf",_l=2*PI*_r,_area=PI*_r*_r);}@end************************************************************************************************************#import <Foundation/Foundation.h>#import "MyCIrcle.h"#define PI 3.1415int main(int argc, const char * argv[]){    @autoreleasepool {                MyCIrcle *circle=[[MyCIrcle alloc]init];        [circle setR:5];        [circle show];    }    return 0;}

3.有一个长方形MyRect类;
类字段: int length; int width; int area;
    方法: 设置长和宽 打印面积 实现这个类的设计

#import <Foundation/Foundation.h>@interface MyRect : NSObject{    int _length;    int _width;    int _area;}-(void)setLength:(int)length;-(int)length;-(void)setWidth:(int)width;-(int)width;-(void)show;@end#import "MyRect.h"@implementation MyRect-(void)setLength:(int)length;{    _length=length;}-(int)length;{    return _length;}-(void)setWidth:(int)width;{    _width=width;}-(int)width;{    return _width;}-(void)show;{    NSLog(@"area=%d",_width*_length);}@end#import <Foundation/Foundation.h>#import "MyRect.h"int main(int argc, const char * argv[]){    @autoreleasepool {                MyRect *rect=[[MyRect alloc] init];        [rect setLength:6];        [rect setWidth:8];        [rect show];            }    return 0;方法二#import <Foundation/Foundation.h>@interface MyRect : NSObject{    int _length;    int _width;    int _area;}-(id)initWithsetLength:(int)length andWidth:(int)width;-(void)show;@end#import "MyRect.h"@implementation MyRect-(id)initWithsetLength:(int)length andWidth:(int)width;{    if (self=[super init]) {        _length=length;        _width=width;    }    return self;}-(void)show;{    NSLog(@"area=%d",_width*_length);}@end#import <Foundation/Foundation.h>#import "MyRect.h"int main(int argc, const char * argv[]){    @autoreleasepool {        MyRect *antherRect=[[MyRect alloc]initWithsetLength:8 andWidth:6];        [antherRect show];            }    return 0;}方法三#import <Foundation/Foundation.h>@interface MyRect : NSObject{    int _length;    int _width;    int _area;}-(void)setLength:(int)length andWidth:(int)width;-(void)show;@end#import "MyRect.h"@implementation MyRect-(void)setLength:(int)length andWidth:(int)width;{    _length=length;    _width=width;}-(void)show;{    NSLog(@"area=%d",_width*_length);}@end#import <Foundation/Foundation.h>#import "MyRect.h"int main(int argc, const char * argv[]){    @autoreleasepool {        MyRect *rect = [[MyRect alloc] init];        [rect setLength:9 andWidth:8];        [rect show];    }    return 0;}

4.设计一个学生类Student,它有属性学号,成绩,性别;分别对这些属性进行赋 值和显示。

#import <Foundation/Foundation.h>//学生类@interface Student : NSObject{    int _sid;    double _score;    char _gender;}//初始化方法-(id)initWithSid:(int)sid andScore:(double)score andGender:(char)gender;-(void)setSid:(int)sid;-(int)sid;-(void)setScore:(double)score;-(double)score;-(void)setGender:(char)gender;-(char)gender;-(void)setSid:(int)sid andScore:(double)score andGender:(char)gender;-(void)show;@end#import "Student.h"@implementation Student-(id)initWithSid:(int)sid andScore:(double)score andGender:(char)gender;{    if (self=[super init]) {        _sid=sid;        _score=score;        _gender=gender;    }    return self;}-(void)setSid:(int)sid;{    _sid=sid;}-(int)sid;{    return _sid;}-(void)setScore:(double)score;{    _score=score;}-(double)score;{    return _score;}-(void)setGender:(char)gender;{    _gender=gender;}-(char)gender;{    return _gender;}-(void)setSid:(int)sid andScore:(double)score andGender:(char)gender;{    _sid=sid;    _score=score;    _gender=gender;}-(void)show;{    NSLog(@"sid=%d score=%lf gender=%c",_sid,_score,_gender);}    @end#import <Foundation/Foundation.h>#import "Student.h"int main(int argc, const char * argv[]){    @autoreleasepool {        Student *student=[[Student alloc] init];        [student setSid:1408028];        [student setScore:99];        [student setGender:'B'];        [student show];                        [student setSid:1408029 andScore:98 andGender:'B'];        [student show];        Student *anotherStudent=[[Student alloc]initWithSid:12345 andScore:89 andGender:'B'];        [anotherStudent show];                            }    return 0;}

5.编写一个分数类:

   类名: Fraction
成员变量: 分子,分母(均为整型)
实例方法:

    1.初始化方法 带两个整型参数分别代表分子分母

    2.带两个参数的设置方法,分别代表分子分母

    3.打印这个分数

@interface QFFraction : NSObject {    int _numerator; //分子    int _denominator; // 分母}- (void) setNumerator:(int)newNumerator;- (int) numerator;- (void) setDenominator:(int)newDenominator;- (int) denominator;// 同时设置分子 分母- (void) setNumerator:(int)newNumerator andDenominator:(int)newDenominator;// 约分- (void) reductionOfFraction;@end************************************************************************************************************#import <Foundation/Foundation.h>@interface MyFraction : NSObject{int _numerator; //分子int _denominator; // 分母}- (void) setNumerator:(int)numerator;- (int) numerator;- (void) setDenominator:(int)denominator;- (int) denominator;// 同时设置分子 分母- (void) setNumerator:(int)numerator andDenominator:(int)denominator;// 约分- (void) reductionOfFraction;@end************************************************************************************************************#import "MyFraction.h"@implementation MyFraction-(void)setNumerator:(int)numerator;{    _numerator=numerator;}-(int)numerator;{    return _numerator;}-(void)setDenominator:(int)denominator;{    _denominator=denominator;}-(int)denominator;{    return _denominator;}// 同时设置分子 分母- (void) setNumerator:(int)numerator andDenominator:(int)denominator;{    _numerator=numerator;    _denominator=denominator;}// 约分- (void) reductionOfFraction;{    NSLog(@"%d/%d",_numerator,_denominator);}@end************************************************************************************************************#import <Foundation/Foundation.h>#import "MyFraction.h"int main(int argc, const char * argv[]){    @autoreleasepool {                        MyFraction *fraction = [[MyFraction alloc] init];        [fraction setNumerator:5];        [fraction setDenominator:9];        [fraction reductionOfFraction];        [fraction setNumerator:4 andDenominator:8];        [fraction reductionOfFraction];    }    return 0;}6. 编写一个四则运算器,从终端输入两个数和一个字符,可以进行加减乘除四则运算。(使用类方法)#import <Foundation/Foundation.h>@interface MyComputer : NSObject+(void)setA:(double)a andB:(double)b andC:(char)character;@end#import "MyComputer.h"@implementation MyComputer+(void)setA:(double)a andB:(double)b andC:(char)character{    switch (character) {        case '+':NSLog(@"%lf",a+b);break;        case '-':NSLog(@"%lf",a-b);break;        case '*':NSLog(@"%lf",a*b);break;        case '/':NSLog(@"%lf",a/b);break;        default:break;    }}@end#import <Foundation/Foundation.h>#import "MyComputer.h"int main(int argc, const char * argv[]){    @autoreleasepool {        [MyComputer setA:2 andB:4 andC:'+'];        [MyComputer setA:2 andB:4 andC:'-'];        [MyComputer setA:2 andB:4 andC:'*'];        [MyComputer setA:2 andB:4 andC:'/'];    }    return 0;}