#include <stdio.h>
#include <stdlib.h>

int main(){
   char cond, op;
   float n1=0,n2=0;

   do{
      system("cls");
      printf("Informe n1: ");
      scanf("%f",&n1);
      printf("Informe op: ");
      scanf(" %c",&op);
      printf("Informe n2: ");
      scanf("%f",&n2);

      switch(op){
         case '+':
            printf("%.2f+%.2f=%.2f",n1,n2,n1+n2);
         break;
         case '-':
            printf("%.2f-%.2f=%.2f",n1,n2,n1-n2);
         break;
         case '*':
            printf("%.2f*%.2f=%.2f",n1,n2,n1*n2);
         break;
         case '/':
            if(n2==0){
               printf("Nao existe divisao por zero");
            }else{
               printf("%.2f/%.2f=%.2f",n1,n2,n1/n2);
            }
         break;
         default:
            printf("\noperador invalido!!!!");
      }

      printf("\ndeseja continuar (s/n)?");
      scanf(" %c",&cond);
   }while(cond=='s');

   return 0;
}