ObjectiveC语言学习（三）

主要内容

1. for循环
2. while循环
3. 控制台输入

－－－－－－－我是分割线－－－－－－－－

1.for循环

<For.h>

#import <Foundation/Foundation.h>

@interface For : NSObject
{
    int sum;
}

- (id) init;

- (int) forFrom:(int)fromNum andTo:(int)toNum;    //定义一个函数为forFrom:andTo:


@end

<For.m>

#import "For.h"

@implementation For

- (id) init
{
    sum = 0;
    return self;
}

- (int) forFrom:(int)fromNum andTo:(int)toNum
{
    for (; fromNum <= toNum; fromNum++)　　//for循环体
    {
        sum += fromNum;
    }
    return sum;
}
@end

2.while循环

<While.h>

#import <Foundation/Foundation.h>

@interface While : NSObject
{
    int sum;
}

- (id) init;
- (int) whileFrom:(int)fNum andTo:(int)tNum;　　//定义函数为whileFrom:andTo:

@end

<While.m>

#import "While.h"

@implementation While

- (id) init
{
    sum = 0;
    return self;
}

- (int) whileFrom:(int)fNum andTo:(int)tNum
{
    while (fNum <= tNum)
    {
        sum += fNum;
        fNum++;
    }
    return sum;
}

@end

<main.m>

#import <Foundation/Foundation.h>
#import "For.h"
#import "While.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool
    {
        int fNum = 1;
        int tNum = 100;
        int sum = 0;
        // insert code here...
        NSLog(@"Hello, World!");
    
        For *f = [[For alloc]init];
        sum = [f forFrom:fNum andTo:tNum];
        NSLog(@"From %d To %d Sum is %d", fNum, tNum, sum);
        
        While *w = [[While alloc]init];
        sum = [w whileFrom:fNum andTo:tNum];
        NSLog(@"From %d To %d Sum is %d", fNum, tNum ,sum);
    }
    return 0;
}

 3.控制台输入

#import <Foundation/Foundation.h>
#import "For.h"
#import "While.h"

int main(int argc, const char * argv[])
{

    @autoreleasepool
    {
        int fNum = 0;
        int tNum = 0;
        int sum = 0;
        // insert code here...
        NSLog(@"Hello, World!");
        
        printf("Please input fromNum: ");
        scanf("%d", &fNum);   //从屏幕输入fNum
        printf("Please input toNum: ");
        scanf("%d", &tNum); //从屏幕输入tNum
        
        For *f = [[For alloc]init];
        sum = [f forFrom:fNum andTo:tNum];
        NSLog(@"For From %d To %d Sum is %d", fNum, tNum, sum);
        
        While *w = [[While alloc]init];
        sum = [w whileFrom:fNum andTo:tNum];
        NSLog(@"While From %d To %d Sum is %d", fNum, tNum ,sum);
    }
    return 0;
}