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  1. #include<stdio.h>
  2. #include<ctype.h>
  3. #include<string.h>
  4.  
  5. int main() {
  6.     FILE *input = fopen("input.c", "r");
  7.     char ch, str[20], dig[20];
  8.     int l = 1, i = 0, k = 0;
  9.     char keyword[6][10] = {"int", "void", "if", "else", "do", "while"};
  10.  
  11.     printf("Line No.\tToken\t\tLexeme\n");
  12.  
  13.     while((ch = fgetc(input)) != EOF) {
  14.         if (ch == '\n') {
  15.             l++;
  16.         } else if (isspace(ch)) {
  17.             continue;
  18.         } else if (ispunct(ch)) {
  19.             if (ch == '/' && (ch = fgetc(input)) == '/') {
  20.                 while ((ch = fgetc(input)) != '\n');
  21.                 l++;
  22.             } else {
  23.                 printf("%d\t\tOperator/Symbol\t%c\n", l, ch);
  24.             }
  25.         } else if (isdigit(ch)) {
  26.             dig[k++] = ch;
  27.             while (isdigit(ch = fgetc(input))) dig[k++] = ch;
  28.             dig[k] = '\0';
  29.             ungetc(ch, input);
  30.             printf("%d\t\tNumber\t\t%s\n", l, dig);
  31.             k = 0;
  32.         } else if (isalpha(ch)) {
  33.             str[i++] = ch;
  34.             while (isalnum(ch = fgetc(input))) str[i++] = ch;
  35.             str[i] = '\0';
  36.             ungetc(ch, input);
  37.  
  38.             int isKeyword = 0;
  39.             for (int j = 0; j < 6; j++) {
  40.                 if (strcmp(str, keyword[j]) == 0) {
  41.                     printf("%d\t\tKeyword\t\t%s\n", l, str);
  42.                     isKeyword = 1;
  43.                     break;
  44.                 }
  45.             }
  46.             if (!isKeyword) {
  47.                 printf("%d\t\tIdentifier\t%s\n", l, str);
  48.             }
  49.             i = 0;
  50.         }
  51.     }
  52.  
  53.     fclose(input);
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout #stderr 0.03s 6988KB
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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/d2IFs4/prog:55:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/kdDjCL
language:
Prolog (swi 7.6.4)
created:
7 days ago
visibility:
public

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