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  1.  %{
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <math.h>
  5.  
  6. // Declare yylval as a union type to hold numbers (doubles)
  7. union {
  8.     double num;
  9. } yylval;
  10.  
  11. // Function to handle errors
  12. void yyerror(const char *s);
  13. %}
  14.  
  15. %option noyywrap
  16.  
  17. DIGIT [0-9]
  18. NUMBER   {DIGIT}+(\.{DIGIT}+)?
  19. ID      [a-zA-Z_][a-zA-Z0-9_]*
  20. %%
  21.  
  22. "1"   { return 1; }
  23. "2"   { return 2; }
  24. "3"   { return 3; }
  25. "4"   { return 4; }
  26. "5"   { return 5; }
  27. "6"   { return 6; }
  28. "7"   { return 7; }
  29. "+"   { return '+'; }
  30. "-"   { return '-'; }
  31. "*"   { return '*'; }
  32. "SQRT" { return 'S'; }
  33. "CQRT" { return 'C'; }
  34. {NUMBER}  { yylval.num = atof(yytext); return 'N'; }
  35. .   { return yytext[0]; }
  36.  
  37. %%
  38.  
  39. // Main function to interact with the user and execute the chosen operation
  40. int main() {
  41.     int choice;
  42.     double num1, num2, result;
  43.  
  44.     printf("Select an operation:\n");
  45.     printf("1. Addition (+)\n");
  46.     printf("2. Subtraction (-)\n");
  47.     printf("3. Multiplication (*)\n");
  48.     printf("4. Square Root (SQRT)\n");
  49.     printf("5. Cube Root (CQRT)\n");
  50.     printf("6. Exit\n");
  51.  
  52.     // Read the user's choice
  53.     scanf("%d", &choice);
  54.  
  55.     switch(choice) {
  56.         case 1: // Addition
  57.             printf("Enter two numbers: ");
  58.             scanf("%lf %lf", &num1, &num2);
  59.             result = num1 + num2;
  60.             printf("Result: %.2f\n", result);
  61.             break;
  62.  
  63.         case 2: // Subtraction
  64.             printf("Enter two numbers: ");
  65.             scanf("%lf %lf", &num1, &num2);
  66.             result = num1 - num2;
  67.             printf("Result: %.2f\n", result);
  68.             break;
  69.  
  70.         case 3: // Multiplication
  71.             printf("Enter two numbers: ");
  72.             scanf("%lf %lf", &num1, &num2);
  73.             result = num1 * num2;
  74.             printf("Result: %.2f\n", result);
  75.             break;
  76.  
  77.         case 4: // Square Root
  78.             printf("Enter a number: ");
  79.             scanf("%lf", &num1);
  80.             if (num1 < 0) {
  81.                 printf("Error: Cannot take square root of a negative number.\n");
  82.             } else {
  83.                 result = sqrt(num1);
  84.                 printf("Square Root: %.2f\n", result);
  85.             }
  86.             break;
  87.  
  88.         case 5: // Cube Root
  89.             printf("Enter a number: ");
  90.             scanf("%lf", &num1);
  91.             result = cbrt(num1);
  92.             printf("Cube Root: %.2f\n", result);
  93.             break;
  94.  
  95.         case 6: // Exit
  96.             printf("Exiting the program.\n");
  97.             return 0;
  98.  
  99.         default:
  100.             printf("Invalid choice!\n");
  101.             break;
  102.     }
  103.  
  104.     return 0;
  105. }
  106.  
  107. // Error handling function
  108. void yyerror(const char *s) {
  109.     fprintf(stderr, "%s\n", s);
  110.     exit(1);
Success #stdin #stdout #stderr 0.03s 6888KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/3LdNwb/prog:2:1: Syntax error: Operator expected
ERROR: /home/3LdNwb/prog:35:5: Syntax error: End of file in quoted atom
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/kAH7vk
language:
Prolog (swi 7.6.4)
created:
12 days ago
visibility:
public

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