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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. void analyzeTokens(const char input[]) {
  6.     printf("\nTokens Found:\n");
  7.  
  8.     for (size_t i = 0; i < strlen(input); ++i) {
  9.         char currentChar = input[i];
  10.  
  11.         // 1. Skip whitespace
  12.         if (isspace((unsigned char)currentChar)) {
  13.             continue;
  14.         }
  15.  
  16.         // 2. Check for potential operator characters
  17.         if (currentChar == '+' || currentChar == '-' || currentChar == '*' ||
  18.             currentChar == '/' || currentChar == '>' || currentChar == '<' ||
  19.             currentChar == '=' || currentChar == '!') {
  20.  
  21.             // 3. The Lookahead: Check if the NEXT character is '='
  22.             if (i + 1 < strlen(input) && input[i + 1] == '=') {
  23.                 // It's a two-character operator
  24.                 printf("OPERATOR: %c=\n", currentChar);
  25.                 i++; // IMPORTANT: Increment 'i' again to consume the '='
  26.             } else {
  27.                 // It's just a single-character operator
  28.                 printf("OPERATOR: %c\n", currentChar);
  29.             }
  30.         }
  31.  
  32.         // Note: You would add 'else if' blocks here to handle letters (identifiers)
  33.         // and numbers (literals) if expanding the analyzer further.
  34.     }
  35. }
  36.  
  37. int main() {
  38.     char codeSnippet[1000];
  39.  
  40.     printf("Enter a simple C code snippet: ");
  41.     fgets(codeSnippet, sizeof(codeSnippet), stdin);
  42.  
  43.     analyzeTokens(codeSnippet);
  44.  
  45.     return 0;
  46. }
Success #stdin #stdout 0s 5320KB
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stdin
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int a+= b
stdout
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Enter a simple C code snippet: 
Tokens Found:
OPERATOR: +=
https://ideone.com/joWoq3
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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