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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. //#include <conio.h>
  4. int main() {
  5.   //clrscr();
  6.   FILE *fp;
  7.   int c;
  8.   int chars  = 0, total  = 0, multi  = 0, single = 0;
  9.  
  10.   enum states { TEXT, SAW_SLASH, SAW_STAR, SINGLE_COMMENT, MULTI_COMMENT } state = TEXT;
  11.  
  12.   fp = fopen( "comments.txt", "r" );
  13.  
  14.   while ( (c = fgetc( fp )) != EOF ){
  15.     chars++;
  16.     switch( state ){
  17.       case TEXT : switch( c ){
  18.           case '/'  : state = SAW_SLASH; break;
  19.           case '\n' : total++; // fall-through
  20.           default   : break;
  21.         }
  22.         break;
  23.  
  24.       case SAW_SLASH : switch( c ) {
  25.           case '/'  : state = SINGLE_COMMENT; break;
  26.           case '*'  : state = MULTI_COMMENT; break;
  27.           case '\n' : total++; // fall through
  28.           default   : state = TEXT; break;
  29.         }
  30.         break;
  31.  
  32.       case SAW_STAR : switch( c ) {
  33.           case '/'  : state = TEXT; multi++; break;
  34.           case '*'  : break;
  35.           case '\n' : total++; //multi++; // fall through
  36.           default   : state = MULTI_COMMENT; break;
  37.         }
  38.         break;
  39.  
  40.       case SINGLE_COMMENT : switch( c ) {
  41.           case '\n' : state = TEXT; total++; single++; // fall through
  42.           default   : break;
  43.         }
  44.         break;
  45.  
  46.       case MULTI_COMMENT : switch( c ) {
  47.           case '*'  : state = SAW_STAR; break;
  48.           case '\n' : total++; //multi++; // fall through
  49.           default   : break;
  50.         }
  51.         break;
  52.  
  53.       default: // NOT REACHABLE
  54.         break;
  55.     }
  56.   }
  57.  
  58.   fclose(fp);
  59.   printf( "Total lines          : %8u\n", total );
  60.   printf( "Single-comment lines : %8u\n", single );
  61.   printf( "Multi-comment lines  : %8u\n", multi );
  62.   //getch();
  63.   return 0;
  64. }
Runtime error #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/I6YXAT
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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