1. /*
   
2. 计算器
   
3. 方法：
   
4. 1、返回π的值
   
5. 2、计算两个数的和
   
6. 3、计算某一个数得平方
   
7. */
   
8. 
   
9. #import<Foundation/Foundation.h>
   
10. 
    
11. //类的声明
    
12. @interface jisuanqi : NSObject//12行
    
13. 
    
14. //返回π的值
    
15. - (double)pi;
    
16. 
    
17. //计算某个数得平方
    
18. - (int)square:(int)num1;
    
19. 
    
20. //计算两个数得和
    
21. - (int)sum:(int)num1 :(int)num2;
    
22. 
    
23. //计算三个数得积
    
24. - (int)jiWithNum1:(int)num1 andNum2:(int)num2 andNum3:(int)num3;
    
25. 
    
26. //计算三个数得积
    
27. -(int)ji2:(int)num1 num2:(int)num2 num3:(int)num3;
    
28. 
    
29. 
    
30. 
    
31. @end
    
32. 
    
33. @implementation jisuanqi
    
34. 
    
35. //返回π的值
    
36. -(double)pi
    
37. {
    
38.     return 3.1415926;
    
39. }
    
40. 
    
41. //计算某个数的平方
    
42. -(int)square:(int)num1
    
43. {
    
44.     return num1*num1;
    
45. }
    
46. 
    
47. //计算两个数的和
    
48. -(int)sum:(int)num1 :(int)num2
    
49. {
    
50.     return num1+num2;
    
51. }
    
52. 
    
53. //计算三个数得积
    
54. - (int)jiWithNum1:(int)num1 andNum2:(int)num2 andNum3:(int)num3
    
55. {
    
56.     return num1*num2*num3;
    
57. }
    
58. 
    
59. 
    
60. -(int)ji2:(int)num1 num2:(int)num2 num3:(int)num3  //有警告
    
61. {
    
62.     return (num1*num2*num3);
    
63. }
    
64. @end
    
65. 
    
66. 
    
67. int main()
    
68. {
    
69.     jisuanqi *jsq = [jisuanqi new];
    
70.    
    
71.     double a = [jsq pi];
    
72.     int b = [jsq square:10];
    
73.     int c = [jsq sum:10:11];
    
74.     int d = [jsq ji:10:11:10];//74行
    
75.     int e = [jsq ji2:10:11:10];//75行
    
76.    
    
77.     NSLog(@"π的值为%f,10的平方为%d,10与11的和为%d,10*11*10=%d,%d",a,b,c,d,e);
    
78. }
    
79. /*
    
80. 出现几个警告：
    
81. 带参数的类方法.m:74:18: warning: instance method '-ji:::' not found
    
82. (return type defaults to 'id') [-Wobjc-method-access]
    
83. int d = [jsq ji:10:11:10];
    
84. ^~
    
85. 带参数的类方法.m:12:12: note: receiver is instance of class declared here
    
86. @interface jisuanqi : NSObject
    
87. ^
    
88. 带参数的类方法.m:74:9: warning: incompatible pointer to integer
    
89. conversion initializing 'int' with an expression of type 'id'
    
90. [-Wint-conversion]
    
91. int d = [jsq ji:10:11:10];
    
92. ^   ~~~~~~~~~~~~~~~~~
    
93. 带参数的类方法.m:75:18: warning: instance method '-ji2:::' not found
    
94. (return type defaults to 'id') [-Wobjc-method-access]
    
95. int e = [jsq ji2:10:11:10];
    
96. ^~~
    
97. 带参数的类方法.m:12:12: note: receiver is instance of class declared here
    
98. @interface jisuanqi : NSObject
    
99. ^
    
100. 带参数的类方法.m:75:9: warning: incompatible pointer to integer
     
101. conversion initializing 'int' with an expression of type 'id'
     
102. [-Wint-conversion]
     
103. int e = [jsq ji2:10:11:10];
     
104. ^   ~~~~~~~~~~~~~~~~~~
     
105. 4 warnings generated.
     
106. */
     
107. 
     
108. 问题出在了，求三个数的积那段代码  但是看不懂下面的警告，是什么意思啊！  该怎么改啊
     
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复制代码

    int b = [jsq square:10];
    int c = [jsq sum:10:11];
    int d = [jsq jiWithNum1:10 andNum2:11 andNum3:10];//74行
    int e = [jsq ji2:10 num2:11 num3:10];//75行

注意你的动态方法名，你的调用写法有问题

魔法少年十三 发表于 2014-10-20 14:09
int b = [jsq square:10];
    int c = [jsq sum:10:11];
    int d = [jsq jiWithNum1:10 andNum2:11  ...

恩，看视频，没看仔细！谢谢啦！