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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <ctype.h>
  4.  
  5. void lexer(char *input) {
  6.     int i = 0;
  7.     int len = strlen(input);
  8.  
  9.     printf("\nTokens Found:\n");
  10.  
  11.     while (i < len) {
  12.  
  13.         if (isspace(input[i])) {
  14.             i++;
  15.             continue;
  16.         }
  17.  
  18.         if (i + 1 < len) {
  19.             char two[3] = {input[i], input[i+1], '\0'};
  20.  
  21.             if (strcmp(two, "+=") == 0 || strcmp(two, "-=") == 0 ||
  22.                 strcmp(two, "/=") == 0 || strcmp(two, "*=") == 0 ||
  23.                 strcmp(two, ">=") == 0 || strcmp(two, "<=") == 0 ||
  24.                 strcmp(two, "==") == 0 || strcmp(two, "!=") == 0) {
  25.  
  26.                 printf("OPERATOR: %s\n", two);
  27.                 i += 2;  
  28.                 continue;
  29.             }
  30.         }
  31.  
  32.         if (input[i] == '+' || input[i] == '-' || input[i] == '*' ||
  33.             input[i] == '/' || input[i] == '=' || input[i] == '>' ||
  34.             input[i] == '<' || input[i] == '!') {
  35.  
  36.             printf("OPERATOR: %c\n", input[i]);
  37.             i++;
  38.             continue;
  39.         }
  40.  
  41.         i++;
  42.     }
  43. }
  44.  
  45. int main() {
  46.    char input[] = "x += 5; y -= 2; z *= 3; w /= 4; a == b; c != d; e >= f; g <= h; i = j + k - l * m / n > o < p ! q";
  47.  
  48.     printf("Testing Lexer with Hardcoded Input:\n");
  49.     printf("%s\n", input);
  50.     lexer(input);
  51.     return 0;
  52. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Testing Lexer with Hardcoded Input:
x += 5; y -= 2; z *= 3; w /= 4; a == b; c != d; e >= f; g <= h; i = j + k - l * m / n > o < p ! q

Tokens Found:
OPERATOR: +=
OPERATOR: -=
OPERATOR: *=
OPERATOR: /=
OPERATOR: ==
OPERATOR: !=
OPERATOR: >=
OPERATOR: <=
OPERATOR: =
OPERATOR: +
OPERATOR: -
OPERATOR: *
OPERATOR: /
OPERATOR: >
OPERATOR: <
OPERATOR: !
https://ideone.com/IgLpaC
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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