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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. char key[100][100], head[100][100], dig[100][100], op[100][100], id[100][100];
  6. int i = 0, j = 0, k = 0, a = 0, b = 0, c = 0, d = 0, m = 0, n = 0;
  7. %}
  8.  
  9. /* Define Regular Expressions */
  10. KW   "int"|"while"|"if"|"else"|"for"|"char"|"float"|"case"|"switch"
  11. HF   "#include<".*">"
  12. OP   "+"|"-"|"*"|"/"|"="
  13. DIG  [0-9]*|[0-9]*"."[0-9]+
  14. ID   [a-zA-Z][a-zA-Z0-9]*
  15.  
  16. %%
  17.  
  18. /* Pattern Matching Rules */
  19. {KW}    { strcpy(key[i], yytext); i++; }
  20. {HF}    { strcpy(head[j], yytext); j++; }
  21. {DIG}   { strcpy(dig[k], yytext); k++; }
  22. {OP}    { strcpy(op[m], yytext); m++; }
  23. {ID}    { strcpy(id[n], yytext); n++; }
  24. .       { /* Ignore other characters */ }
  25.  
  26. %%
  27.  
  28. /* Main Function */
  29. int main() {
  30.     yyin = fopen("input.c", "r+");
  31.     yylex();
  32.  
  33.     printf("\nThe keywords are:");
  34.     for (a = 0; a < i; a++) {
  35.         printf("\n%s", key[a]);
  36.     }
  37.  
  38.     printf("\nThe header files are:");
  39.     for (b = 0; b < j; b++) {
  40.         printf("\n%s", head[b]);
  41.     }
  42.  
  43.     printf("\nThe digits are:");
  44.     for (c = 0; c < k; c++) {
  45.         printf("\n%s", dig[c]);
  46.     }
  47.  
  48.     printf("\nThe operators are:");
  49.     for (d = 0; d < m; d++) {
  50.         printf("\n%s", op[d]);
  51.     }
  52.  
  53.     printf("\nThe identifiers are:");
  54.     for (d = 0; d < n; d++) {
  55.         printf("\n%s", id[d]);
  56.     }
  57.  
  58.     return 0;
  59. }
  60.  
  61. /* Function to Handle End of File */
  62. int yywrap() {
  63.     return 1;
  64. }
  65.  
Success #stdin #stdout #stderr 0.02s 7048KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/SBGHLO/prog:2:1: Syntax error: Operator expected
ERROR: /home/SBGHLO/prog:64:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/StQl2O
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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