哪错了？

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1. #include<stdio.h>
   
2. int days_in_month(int);
   
3. int nth_item(FILE *,int);
   
4. main()
   
5. {
   
6. int heat_deg_days,solar_insol,coldest_mon,heating_reg,efficiency,collect_area,ct,status,next_hdd;
   
7. double floor_space,heat_loss,energy_resrc;
   
8. FILE *hdd_file;
   
9. FILE *solar_file;
   
10. hdd_file=fopen("hdd.txt","r");
    
11. fscanf(hdd_file,"%d",&heat_deg_days);
    
12. coldest_mon=1;
    
13. ct=2;
    
14. status=fscanf(hdd_file,"%d",&next_hdd);
    
15. while(status==1)
    
16. {
    
17.   if(next_hdd>heat_deg_days)
    
18.   {
    
19.    heat_deg_days=next_hdd;
    
20.    coldest_mon=ct;
    
21. }
    
22. ++ct;
    
23. status=fscanf(hdd_file,"%d",&next_hdd);
    
24. }
    
25. fclose(hdd_file);
    
26. 
    
27. 
    
28. solar_file=fopen("solar.txt","r");
    
29. solar_insol=nth_item(solar_file,coldest_mon);
    
30. fclose(solar_file);
    
31. 
    
32. 
    
33. printf("What is the approximate heating requirement(Btu/");
    
34. printf("degree day ft^2)of this type of construction?=>");
    
35. scanf("%d",&heating_req);
    
36. printf("What percent of solar insolation will be converted");
    
37. printf("to usadle heat?=>");
    
38. scanf("%d",&efficiency);
    
39. printf("What is the floor space(ft^2)?=>");
    
40. scanf("%lf",&floor_space);
    
41. 
    
42. 
    
43. energy_resrc=efficiency*0.01*solar_insol*days_in_month(coldest_mon);
    
44. collect_area=(int)(heat_loss/energy_resrc+0.5);
    
45. 
    
46. 
    
47. printf("To replace heat loss of %.0f Btu in the",heat_loss);
    
48. printf("coldest month (month %d)with available",coldest_mon);
    
49. printf("solar insolation of %d Btu/ft^2/day,",solar_insol);
    
50. printf("and anXnefficiency of %d percentf",efficiency);
    
51. printf("use a solar collecting area of %d",collect_area);
    
52. printf("ft^2.");
    
53. return 0;
    
54. }
    
55. int days_in_month(int month_number)
    
56. {
    
57. int ans;
    
58. switch(month_number)
    
59. {
    
60.    case2:ans=28;break;
    
61.    case4:
    
62.    case6:
    
63.    case9:
    
64.    case11:ans=30;break;
    
65.    default:ans=31;
    
66. }
    
67. return ans;
    
68. }

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