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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     char operator;
  5.     double num1, num2;
  6.  
  7.     // รับค่าตัวเลขและตัวดำเนินการจากผู้ใช้
  8.     printf("Enter first number: ");
  9.     scanf("%lf", &num1);
  10.  
  11.     printf("Enter an operator (+, -, *, /): ");
  12.     scanf(" %c", &operator);
  13.  
  14.     printf("Enter second number: ");
  15.     scanf("%lf", &num2);
  16.  
  17.     // คำนวณตามตัวดำเนินการที่ผู้ใช้ใส่
  18.     switch (operator) {
  19.         case '+':
  20.             printf("Result: %.2f\n", num1 + num2);
  21.             break;
  22.         case '-':
  23.             printf("Result: %.2f\n", num1 - num2);
  24.             break;
  25.         case '*':
  26.             printf("Result: %.2f\n", num1 * num2);
  27.             break;
  28.         case '/':
  29.             if (num2 != 0) {
  30.                 printf("Result: %.2f\n", num1 / num2);
  31.             } else {
  32.                 printf("Error: Division by zero is not allowed.\n");
  33.             }
  34.             break;
  35.         default:
  36.             printf("Error: Invalid operator.\n");
  37.             break;
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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Enter first number: Enter an operator (+, -, *, /): Enter second number: Error: Invalid operator.
https://ideone.com/JfhyCp
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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