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  1. #include <stdio.h>
  2. #include <ctype.h>
  3. #include <string.h>
  4.  
  5. char keywords[5][10] = {"int", "float", "if", "else", "return"};
  6.  
  7. int isKeyword(char *word) {
  8.     for (int i = 0; i < 5; i++) {
  9.         if (strcmp(word, keywords[i]) == 0)
  10.             return 1;
  11.     }
  12.     return 0;
  13. }
  14.  
  15. int main() {
  16.     char ch, buffer[50];
  17.     int i = 0;
  18.  
  19.     FILE *fp = fopen("input.c", "r");
  20.     if (fp == NULL) {
  21.         printf("Cannot open file\n");
  22.         return 1;
  23.     }
  24.  
  25.     while ((ch = fgetc(fp)) != EOF) {
  26.  
  27.         // Identifier or keyword
  28.         if (isalpha(ch)) {
  29.             buffer[i++] = ch;
  30.             while (isalnum(ch = fgetc(fp))) {
  31.                 buffer[i++] = ch;
  32.             }
  33.             buffer[i] = '\0';
  34.             i = 0;
  35.             fseek(fp, -1, SEEK_CUR);
  36.  
  37.             if (isKeyword(buffer))
  38.                 printf("Keyword: %s\n", buffer);
  39.             else
  40.                 printf("Identifier: %s\n", buffer);
  41.         }
  42.  
  43.         // Number
  44.         else if (isdigit(ch)) {
  45.             buffer[i++] = ch;
  46.             while (isdigit(ch = fgetc(fp))) {
  47.                 buffer[i++] = ch;
  48.             }
  49.             buffer[i] = '\0';
  50.             i = 0;
  51.             fseek(fp, -1, SEEK_CUR);
  52.  
  53.             printf("Number: %s\n", buffer);
  54.         }
  55.  
  56.         // Operators
  57.         else if (ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '=') {
  58.             printf("Operator: %c\n", ch);
  59.         }
  60.  
  61.         // Special characters
  62.         else if (ch == ';' || ch == ',' || ch == '(' || ch == ')' ||
  63.                  ch == '{' || ch == '}') {
  64.             printf("Special Symbol: %c\n", ch);
  65.         }
  66.     }
  67.  
  68.     fclose(fp);
  69.     return 0;
  70. }
  71.  
Success #stdin #stdout #stderr 0.03s 6780KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/35I34E/prog:70:1: Syntax error: end_of_file_in_quasi_quotation
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/Q4YEvn
language:
Prolog (swi 7.6.4)
created:
23 hours ago
visibility:
public

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