OBJECTIVE-C Syntax Application

Simple Zoo System implementation

#import<Foundation/Foundation.h>#import "Animal.h"//Zoo@interfaceZoo:nsobject@property (nonatomic, strong) Animal*animal;//Animal@property (nonatomic, assign)intFoodsave;//Food Storage/** * Initialize Method The quantity of food passed in the reserve*/- (ID) Initwithfoodsave: (int) Foodsave;@end

#import " Zoo.h " @implementation Zoo-(ID) Initwithfoodsave: (int) foodsave {    if (self = [super Init]) {        = foodsave;    }     return Self ;} @end

There are various animals in the zoo, the following code constructs the animal class, implements by the inheritance way:

#import<Foundation/Foundation.h>@interfaceAnimal:nsobject@property (nonatomic, assign)intCount//Quantity@property (nonatomic, assign)intEatfood;//Food Intake@property (nonatomic, assign)intProductioncycle;//Production Cycle//Custom Initialization Incoming 3 parameters: 1. The current number of animals 2. The amount of food that the animal eats every day 3. The production cycle is the number of days- (ID) Initwithcount: (int) cout Andeatfood: (int) Eatfood Andproductioncycle: (int) productioncycle;//Eat something- (int) Animaleatfood;//Raw Baby- (int) Productionbaby;@end#import "Animal.h"@implementationAnimal- (ID) Initwithcount: (int) cout Andeatfood: (int) Eatfood Andproductioncycle: (int) productioncycle {if(self =[Super Init]) {Self.count=cout; Self.eatfood=Eatfood; Self.productioncycle=productioncycle; }    returnSelf ;}//Eat something- (int) Animaleatfood {NSLog (@"I ate.!!!!%d%d", Self.eatfood, Self.count); returnSelf.eatfood *Self.count;}//Raw Baby- (int) Productionbaby {return 0;}@end

#import "Animal.h"@interfacePanda:animal@end#import "Panda.h"@implementationPanda//overriding the parent class method- (int) Animaleatfood {NSLog (@"Pandas eat%d units of food, existing%d", Self.eatfood *Self.count, Self.count); returnSelf.eatfood *Self.count;}- (int) Productionbaby {NSLog (@"the panda has produced 3 babies."); Self.count+=3; return 3;}@end#import "Animal.h"@interfaceElephant:animal@end#import "Elephant.h"@implementationElephant- (int) Animaleatfood {NSLog (@"Elephants eat%d units of food, existing%d", Self.eatfood *Self.count, Self.count); returnSelf.eatfood *Self.count;}- (int) Productionbaby {NSLog (@"the elephant produced 1 babies."); Self.count+=1; return 1;}@end#import "Animal.h"@interfaceKangaroo:animal@end#import "Kangaroo.h"@implementationKangaroo- (int) Animaleatfood {NSLog (@"Kangaroo eats%d units of food, existing%d", Self.eatfood *Self.count, Self.count); returnSelf.eatfood *Self.count;}- (int) Productionbaby {NSLog (@"Kangaroo produces 2 babies."); Self.count+=2; return 2;}@end

The following is the test code in the main function:

#import<Foundation/Foundation.h>#import "Zoo.h"#import "Panda.h"#import "Elephant.h"#import "Kangaroo.h"intMainintargcConst Char*argv[]) {@autoreleasepool {//Create an Animal object and initialize the stored foodZoo *zoo = [[Zoo alloc] Initwithfoodsave: +]; //initializing various animal information (using polymorphism)Animal *panda = [[Panda alloc] Initwithcount:2Andeatfood:1Andproductioncycle:3]; Animal*elephant = [[Elephant alloc] Initwithcount:2Andeatfood:5Andproductioncycle:5]; Animal*kangaroo = [[Kangaroo alloc] Initwithcount:2Andeatfood:2Andproductioncycle:4]; intDay =1;  while(Zoo.foodsave >0) {            //when the animal's production cycle begins, the animals begin to produce            if(day% Panda.productioncycle = =0) {[Panda Productionbaby]; }            if(day% Elephant.productioncycle = =0) {[Elephant Productionbaby]; }            if(day% Kangaroo.productioncycle = =0) {[Kangaroo productionbaby]; }                        intUsedfood = [Panda Animaleatfood] + [elephant Animaleatfood] +[Kangaroo Animaleatfood]; Zoo.foodsave-=Usedfood; NSLog (@"%d days, remaining food%d", day++, Zoo.foodsave); //If the food is not enough for the animal to use for one day, it must be purchased and should not continue at this time, so let food be 0            if(Zoo.foodsave <Usedfood) {Zoo.foodsave=0; }        }    }    return 0;}

OBJECTIVE-C Syntax Application