main.c

#include <stdio.h>

int main(){
  
  char operator;
  double firstNumber, secondNumber;

  printf("Enter an operator (+, -, *, /)");
  scanf("%c", &operator);

  printf("Enter two operands: ");
  scanf("%lf %lf", &firstNumber, &secondNumber);

  switch (operator){
    case '+':
      printf("%.1lf + %1lf = %1lf\n", firstNumber, secondNumber, firstNumber + secondNumber);
      break;
    case '-':
      printf("%.1lf - %1lf = %1lf\n", firstNumber, secondNumber, firstNumber - secondNumber);
      break;
    case '*':
      printf("%.1lf * %1lf = %1lf\n", firstNumber, secondNumber, firstNumber * secondNumber);
      break;
    case '/':
      printf("%.1lf / %1lf = %1lf\n", firstNumber, secondNumber, firstNumber / secondNumber);
      break;
    default:
      printf("Operator is not correct");
  }
}