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  1. #include <stdio.h>
  2. %{
  3. int result = 0, num1 = 0, num2 = 0, case_num = 0;
  4. %}
  5.  
  6. %option noyywrap
  7.  
  8. %%
  9.  
  10. "case1"     { case_num = 1; }
  11. "case2"     { case_num = 2; }
  12. "case3"     { case_num = 3; }
  13. "case4"     { case_num = 4; }
  14. [0-9]+      { sscanf(yytext, "%d", &num1); }
  15. [0-9]+      { sscanf(yytext, "%d", &num2); }
  16.  
  17. %%
  18.  
  19. int main() {
  20.     printf("Enter two numbers (num1 and num2) and case numbers (1 for addition, 2 for subtraction, 3 for multiplication, and 4 for division):\n");
  21.     yylex();
  22.  
  23.     switch (case_num) {
  24.         case 1:
  25.             result = num1 + num2;
  26.             printf("Result of addition: %d\n", result);
  27.             break;
  28.         case 2:
  29.             result = num1 - num2;
  30.             printf("Result of subtraction: %d\n", result);
  31.             break;
  32.         case 3:
  33.             result = num1 * num2;
  34.             printf("Result of multiplication: %d\n", result);
  35.             break;
  36.         case 4:
  37.             if (num2 != 0) {
  38.                 result = num1 / num2;
  39.                 printf("Result of division: %d\n", result);
  40.             } else {
  41.                 printf("Error: Division by zero is not allowed.\n");
  42.             }
  43.             break;
  44.         default:
  45.             printf("Error: Invalid case number.\n");
  46.     }
  47.     return 0;
  48. }
  49.  
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/xNAZAl/prog:48:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/ijsLVg
language:
Prolog (swi 7.6.4)
created:
2 days ago
visibility:
public

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