ObjectiveC语言学习（三）

主要内容

for循环
while循环
控制台输入

－－－－－－－我是分割线－－－－－－－－

1.for循环

<For.h>

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface For : NSObject
 4 {
 5     int sum;
 6 }
 7 
 8 - (id) init;
 9 
10 - (int) forFrom:(int)fromNum andTo:(int)toNum;    //定义一个函数为forFrom:andTo:
11 
12 
13 @end

<For.m>

 1 #import "For.h"
 2 
 3 @implementation For
 4 
 5 - (id) init
 6 {
 7     sum = 0;
 8     return self;
 9 }
10 
11 - (int) forFrom:(int)fromNum andTo:(int)toNum
12 {
13     for (; fromNum <= toNum; fromNum++)　　//for循环体
14     {
15         sum += fromNum;
16     }
17     return sum;
18 }
19 @end

2.while循环

<While.h>

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface While : NSObject
 4 {
 5     int sum;
 6 }
 7 
 8 - (id) init;
 9 - (int) whileFrom:(int)fNum andTo:(int)tNum;　　//定义函数为whileFrom:andTo:
10 
11 @end

<While.m>

 1 #import "While.h"
 2 
 3 @implementation While
 4 
 5 - (id) init
 6 {
 7     sum = 0;
 8     return self;
 9 }
10 
11 - (int) whileFrom:(int)fNum andTo:(int)tNum
12 {
13     while (fNum <= tNum)
14     {
15         sum += fNum;
16         fNum++;
17     }
18     return sum;
19 }
20 
21 @end

<main.m>

 1 #import <Foundation/Foundation.h>
 2 #import "For.h"
 3 #import "While.h"
 4 
 5 int main(int argc, const char * argv[])
 6 {
 7 
 8     @autoreleasepool
 9     {
10         int fNum = 1;
11         int tNum = 100;
12         int sum = 0;
13         // insert code here...
14         NSLog(@"Hello, World!");
15     
16         For *f = [[For alloc]init];
17         sum = [f forFrom:fNum andTo:tNum];
18         NSLog(@"From %d To %d Sum is %d", fNum, tNum, sum);
19         
20         While *w = [[While alloc]init];
21         sum = [w whileFrom:fNum andTo:tNum];
22         NSLog(@"From %d To %d Sum is %d", fNum, tNum ,sum);
23     }
24     return 0;
25 }

3.控制台输入

 1 #import <Foundation/Foundation.h>
 2 #import "For.h"
 3 #import "While.h"
 4 
 5 int main(int argc, const char * argv[])
 6 {
 7 
 8     @autoreleasepool
 9     {
10         int fNum = 0;
11         int tNum = 0;
12         int sum = 0;
13         // insert code here...
14         NSLog(@"Hello, World!");
15         
16         printf("Please input fromNum: ");
17         scanf("%d", &fNum);   //从屏幕输入fNum
18         printf("Please input toNum: ");
19         scanf("%d", &tNum); //从屏幕输入tNum
20         
21         For *f = [[For alloc]init];
22         sum = [f forFrom:fNum andTo:tNum];
23         NSLog(@"For From %d To %d Sum is %d", fNum, tNum, sum);
24         
25         While *w = [[While alloc]init];
26         sum = [w whileFrom:fNum andTo:tNum];
27         NSLog(@"While From %d To %d Sum is %d", fNum, tNum ,sum);
28     }
29     return 0;
30 }