Simple calculator using switch case(+-*/)

#include <stdio.h>
int main()
{
    float a,b ;
    char op ;

    printf("Enter the operator :");
    scanf("%c", &op);
    printf("Enter two  numbers : " );
    scanf( "%f %f", &a, &b);



    switch (op) {

     case'+':
     printf("%.2f + %.2f = %.2f\n " , a,b, a + b);
     break;


      case'-':
     printf("%.2f - %.2f = %.2f\n " , a,b, a - b);
     break;

      case'*':
     printf("%.2f * %.2f = %.2f\n " , a,b, a * b);
     break;

      case'/':
     printf("%.2f / %.2f = %.2f\n " , a,b, a / b);
     break;


    default:
    printf("invalid input");
}
}