Apakah jenis kata kunci yang berbeza dalam bahasa C?

#include <stdio.h>
int main(){
   char Operator;
   float num1, num2, result = 0;
   printf("</p><p> Try to Enter an Operator (+, -, *, /) : ");
   scanf("%c", &Operator);
   printf("</p><p> Enter the Values for two Operands: ");
   scanf("%f%f", &num1, &num2);
   switch(Operator){
      case &#39;+&#39;: result = num1 + num2;
      break;
      case &#39;-&#39;: result = num1 - num2;
      break;
      case &#39;*&#39;: result = num1 * num2;
      break;
      case &#39;/&#39;: result = num1 / num2;
      break;
      default: printf("</p><p> entered operator is invalid ");
   }
   printf("</p><p> The result of %.2f %c %.2f = %.2f", num1, Operator, num2, result);
   return 0;
}

Enter an Operator (+, -, *, /) : *
Enter the Values for two Operands: 34 12
The result of 34.00 * 12.00 = 408.00