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  1. # include <stdio.h>
  2.  
  3. int main() {
  4.  
  5.     char operator;
  6.     double firstNumber,secondNumber;
  7.  
  8.     printf("Enter an operator (+, -, *, /): ");
  9.     scanf("%c", &operator);
  10.  
  11.     printf("Enter two operands: ");
  12.     scanf("%lf %lf",&firstNumber, &secondNumber);
  13.  
  14.     switch(operator)
  15.     {
  16.         case '+':
  17.             printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber+secondNumber);
  18.             break;
  19.  
  20.         case '-':
  21.             printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber-secondNumber);
  22.             break;
  23.  
  24.         case '*':
  25.             printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber*secondNumber);
  26.             break;
  27.  
  28.         case '/':
  29.             printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber/firstNumber);
  30.             break;
  31.  
  32.         // operator is doesn't match any case constant (+, -, *, /)
  33.         default:
  34.             printf("Error! operator is not correct");
  35.     }
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0s 2172KB
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Standard input is empty
stdout
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Enter an operator (+, -, *, /): Enter two operands: Error! operator is not correct
https://ideone.com/GI8ALy
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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