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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     char operator;
  5.     double num1, num2, result;
  6.  
  7.     // รับอินพุตจากผู้ใช้
  8.     printf("Enter an operator (+, -, *, /): ");
  9.     scanf("%c", &operator);
  10.  
  11.     printf("Enter two numbers: ");
  12.     scanf("%lf %lf", &num1, &num2);
  13.  
  14.     // การคำนวณตาม operator ที่เลือก
  15.     switch (operator) {
  16.         case '+':
  17.             result = num1 + num2;
  18.             printf("%.2lf + %.2lf = %.2lf\n", num1, num2, result);
  19.             break;
  20.         case '-':
  21.             result = num1 - num2;
  22.             printf("%.2lf - %.2lf = %.2lf\n", num1, num2, result);
  23.             break;
  24.         case '*':
  25.             result = num1 * num2;
  26.             printf("%.2lf * %.2lf = %.2lf\n", num1, num2, result);
  27.             break;
  28.         case '/':
  29.             if (num2 != 0) {
  30.                 result = num1 / num2;
  31.                 printf("%.2lf / %.2lf = %.2lf\n", num1, num2, result);
  32.             } else {
  33.                 printf("Error! Division by zero is not allowed.\n");
  34.             }
  35.             break;
  36.         default:
  37.             printf("Error! Invalid operator.\n");
  38.     }
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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Enter an operator (+, -, *, /): Enter two numbers: Error! Invalid operator.
https://ideone.com/kkybFz
language:
C (gcc 8.3)
created:
284 days ago
visibility:
public

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