C language : Get a file's check sum and character number

 1 //++++++++++++++++++++++++++
 2  //      csum_count.cpp
 3  //++++++++++++++++++++++++++
 4  
 5  ///#include head file
 6  #include <stdio.h>
 7  //#include <stdlib.h>
 8  
 9  
10  ///main_entry
11  main(int argc,char *argv[])
12  {
13  
14  
15      ///declare
16      FILE *out_file;
17      FILE *in_file;
18      int ch;
19      unsigned long word_count;
20      unsigned long checksum;
21  
22  
23      ///Open rb-file
24      in_file=fopen(argv[1],"rb");
25  
26  
27      ///Is file
28      if (in_file==NULL)
29      {
30  
31  
32          ///Prompt error !
33          printf("Cannot open %s\n",argv[1]);
34  
35  
36          ///main_EXIT
37          return(1);
38  
39  
40          /// +
41      }//end if
42  
43  
44      ///Initial value
45      word_count=0;
46      checksum=0;
47  
48  
49      ///Read a char
50      ch=fgetc(in_file);
51  
52  
53      ///Loop till EOF
54      while(ch!=EOF)
55      {
56  
57  
58          ///Increase counter
59          word_count++;
60          checksum=checksum+ch;
61  
62  
63          ///Read a char
64          ch=fgetc(in_file);
65  
66  
67          /// +
68      } //end while
69  
70  
71      ///Display checksum
72      printf("%s  " "Checksum = %lx,\n",argv[1] ,checksum);
73  
74  
75      ///Display ch_count
76      printf("%s  " "Character count = %ld \n",argv[1] ,word_count);
77  
78  
79      ///Close rb-file
80      fclose(in_file);
81  
82  
83      ///main_end
84      return 0;
85  } //main_end
86  
87