#include
     
      int main(void){    double value1,value2;    char op;    printf("Type in a impression:");    scanf("%lf%lf",&value1,&op,&value2);    switch(op){    case'+':        printf("=%.2f\n",value1+value2);        break;    case'-':        printf("%.2f\n",value1-value2);        break;    case'*':        printf("%.2f\n",value1*value2);        break;    case'/':        printf("%.2f\n",value1/value2);        break;    default:        printf("Unknown operator\n");        break;    }    return 0;    }