Below are some examples of C-- code that can be used to test the error handling of your parser. In some cases, your parser should be able to recover from the error and continue parsing. In other more problematic cases, the parser can immediately quit.

1. C-- code

   int main() {
     int x;
     int y;
     
     x = 0
     y = 5;
   
     while (x < y) {
       write x
       writeln;
       x = x + * 1;
     }
   }
   

   Parser output

   Error on line 6: expected semi, but found id
     y = 5;
   
   Error on line 10: expected semi, but found writeln
       writeln;
   
   Error on line 11: invalid expression
       x = x + * 1;
   
   Parser found 3 errors.
   

2. C-- code

   int x;
   
   int double(int y) {
     return 2*y;
   }
   
   int main() {
     read x;
     write double(x);
     return 1
   

   Parser output

   Error on line 12: expected semi, but found done
   
   Error on line 12: unexpected end of file, missing closing brace
   
   Parser found 2 errors.
   

3. C-- code

   int x;
   
   int double(int y) {
     return 2*y;
   
   
   int main() {
     read x;
     write double(x);
     return 1;
   }
   

   Parser output

   Error on line 7: invalid expression
   int main() {
   
   Error on line 7: unexpected end of function, missing closing brace
   
   Parser found 2 errors.
   

4. C-- code

   int x;
   char ;
   
   int main() {
       x = 10;
       y = 'a';
       write x;
       write y;
   }
   

   Parser output

   Error on line 2: missing identifier in declaration
   char ;
   
   Parser found 1 error.
   

5. C-- code

   int x;
   char y
   
   int main() {
       x = 10;
       y = 'a';
       write x;
       write y;
   }
   

   Parser output

   Error on line 4: expected lparen, but found int
   int main() {
   
   Parser found 1 error.