Objective-C的循环结构的一些练习

1.编写一个程序，为所有从1~10之间的整数n生成并显示n和n²的表，确保能打印出正确的列标题。

 1 //
 2 //  main.m
 3 //  LogXu
 4 //
 5 //  Created by 许朕 on 15/2/9.
 6 //  Copyright (c) 2015年 com.example. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 int main(int argc, const char * argv[]) {
12     @autoreleasepool {
13         int n;　　　　
14         int product;　　　　
15         NSLog(@"table n           table n²");
16         NSLog(@"---------          -----------------");
17         for (n=1; n<=10; n++) {
18             product=n*n;
19             NSLog(@"n=%2i               n²=%i",n,product);
20         }
21         
22         
23         NSLog(@"Hello, World!");
24     }
25     return 0;
26 }

2015-02-09 11:59:46.940 LogXu[3193:375201] table n           table n²
2015-02-09 11:59:46.941 LogXu[3193:375201] ---------          -----------------
2015-02-09 11:59:46.941 LogXu[3193:375201] n= 1               n²=1
2015-02-09 11:59:46.941 LogXu[3193:375201] n= 2               n²=4
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 3               n²=9
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 4               n²=16
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 5               n²=25
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 6               n²=36
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 7               n²=49
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 8               n²=64
2015-02-09 11:59:46.942 LogXu[3193:375201] n= 9               n²=81
2015-02-09 11:59:46.943 LogXu[3193:375201] n=10               n²=100
2015-02-09 11:59:46.943 LogXu[3193:375201] Hello, World!

2.编写一个程序，生成并打印前10个整数的阶乘表。

 1 //
 2 //  main.m
 3 //  LogXu
 4 //
 5 //  Created by 许朕 on 15/2/9.
 6 //  Copyright (c) 2015年 com.example. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 int main(int argc, const char * argv[]) {
12     @autoreleasepool {
13         int n;
14         int factorial=1;
15         for (n=1; n<=10; n++) {
16             factorial*= n;
17         }
18         NSLog(@"n'factorial= %i",factorial);
19         NSLog(@"Hello, World!");
20     }
21     return 0;
22 }

1 2015-02-09 12:09:47.990 LogXu[3311:382170] n'factorial= 3628800
2 2015-02-09 12:09:47.991 LogXu[3311:382170] Hello, World!

3.计算整数各位上数字的和。该程序可接收用户输入的任意整数。

 1 //
 2 //  main.m
 3 //  LogXu
 4 //
 5 //  Created by 许朕 on 15/2/9.
 6 //  Copyright (c) 2015年 com.example. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 int main(int argc, const char * argv[]) {
12     @autoreleasepool {
13         int n;
14         int right_number = 0;
15         int sum = 0;
16         NSLog(@"Please Input a Integer number:");
17         scanf("%i",&n);
18         while (n!=0) {
19             right_number = n%10;
20             NSLog(@"%i",right_number);
21             n=n/10;
22             sum=sum+right_number;
23         }
24         NSLog(@"Sum= %i",sum);
25         NSLog(@"Hello, World!");
26     }
27     return 0;
28 }

2015-02-09 13:23:44.918 LogXu[3459:396460] Please Input a Integer number:
2155
2015-02-09 13:23:48.334 LogXu[3459:396460] 5
2015-02-09 13:23:48.335 LogXu[3459:396460] 5
2015-02-09 13:23:48.335 LogXu[3459:396460] 1
2015-02-09 13:23:48.335 LogXu[3459:396460] 2
2015-02-09 13:23:48.335 LogXu[3459:396460] Sum= 13
2015-02-09 13:23:48.336 LogXu[3459:396460] Hello, World!