#include <stdio.h>

int main()
{
 int a,b;
 char opera;

 printf("1.Zahl : ");
 scanf("%d",&a); 

 printf("Operator(+,-,*,/): ");
 scanf("%c",&opera);

 printf("2.Zahl : ");
 scanf("%d",&b);

 switch(opera)
   {
     case '+' : printf("%d + %d = %d\n",a,b,a+b);
                     break;

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

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

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

     default : printf("'%c' ist kein Rechenoperator\n",opera);
                     break;
   }      /*Ende switch*/
 return 0; 
}