书上的例，但我不知错在哪里

wake_up

书上的一个讲解多模块的makefile的例，我make时错了。

1. 
   
2. compute.h
   
3. double compute(double,double);
   
4. 
   
5. input.h
   
6. double input(char *);
   
7. 
   
8. main.h
   
9. const char *PROMPT1="Enter the value of x:"
   
10. const char *PROMPT2="Enter the value of y:"
    
11. 
    
12. compute.c
    
13. #include "compute.h"
    
14. 
    
15. double compute(doulbe x, double y)
    
16. {
    
17.         return(prow((double)x, (double)y);
    
18. }
    
19. 
    
20. input.c
    
21. #include "input.h"
    
22. 
    
23. double input(const char *s)
    
24. {
    
25.         float x;
    
26. 
    
27.         printf("%s",s);
    
28.         scanf("%f",&x);
    
29.         return(x);
    
30. }
    
31. 
    
32. 
    
33. main.c
    
34. #include <stdio.h>
    
35. #include "main.h"
    
36. #include "compute.h"
    
37. #include "input.h"
    
38. 
    
39. main()
    
40. {
    
41.         double x,y;
    
42. 
    
43.         printf("The program takes x and y rtom stdio and display X^y.\n");
    
44.         x=input(PROMPT1);
    
45.         y=input(PROMPT2);
    
46.         printf("x^y is: %6.3f\n",compute(x,y));
    
47. }
    
48. 
    
49. 
    
50. makefile
    
51. power:main.o input.o compute.o
    
52.         gcc main.o input.o compute.o -o power -lm
    
53. main.o:main.c main.h input.h compute.h
    
54.         gcc -c main.c
    
55. input.o:input.c input.h
    
56.         gcc -c input.c
    
57. compute.o:compute.c compute.h
    
58.         gcc -c compute.c
    
59. 
    

复制代码

编译错
[chh@wake c]$ make
gcc -c main.c
In file included from main.c:2:
main.h:2: parse error before "const"
main.c: In function `main':
main.c:11: warning: passing arg 1 of `input' discards qualifiers from pointer target type
main.c:12: `PROMPT2' undeclared (first use in this function)
main.c:12: (Each undeclared identifier is reported only once
main.c:12: for each function it appears in.)
make: *** [main.o] 错误 1

kj501

这不makefile的错，是程序出错了。
main.h的两个语句后面少了分号。加上即可。

wake_up

版主大人，我的还是不行，厚着脸皮还要请你教我。
按你说的我改了。又有新的错

1. 
   
2. [chh@wake c]$ make
   
3. gcc -c main.c
   
4. main.c: In function `main':
   
5. main.c:11: warning: passing arg 1 of `input' discards qualifiers from pointer ta
   
6. rget type
   
7. main.c:12: warning: passing arg 1 of `input' discards qualifiers from pointer ta
   
8. rget type
   
9. gcc -c input.c
   
10. input.c:4: conflicting types for `input'
    
11. input.h:1: previous declaration of `input'
    
12. make: *** [input.o] 错误 1
    
13. 
    

复制代码

于是，我把input.h改成这个样子
double input(const char *);
于是，又有了新错。
[chh@wake c]$ make
gcc -c input.c
gcc -c compute.c
compute.c:3: parse error before "x"
compute.c: In function `compute':
compute.c:4: number of arguments doesn't match prototype
compute.h:1: prototype declaration
compute.c:5: `x' undeclared (first use in this function)
compute.c:5: (Each undeclared identifier is reported only once
compute.c:5: for each function it appears in.)
compute.c:5: `y' undeclared (first use in this function)
compute.c:5: parse error before ';' token
make: *** [compute.o] 错误 1
于是，我又改在compute.c中加了
double x,y;
于是又有
[chh@wake c]$ make
gcc -c compute.c
compute.c:5: parse error before "x"
compute.c: In function `compute':
compute.c:6: number of arguments doesn't match prototype
compute.h:1: prototype declaration
compute.c:7: parse error before ';' token
make: *** [compute.o] 错误 1
这次不知所云了。 我真的想学c语言，请版主帮助.谢谢

trinity

你的compute.c中第三行参数表中的第一个double写错了，成了doulbe

wake_up

真不好意思，我太粗心了，给大家添麻烦了，谢谢两位大哥。
我已经成了。