#include
     
      int main(void){    double value1,value2;    char op;     printf("Type in an expression:");     scanf("%lf%c%lf",&value1,&op,&value2);          if(op=='+')         printf("=%.2f\n",value1+value2);       else if(op=='-')        printf("=%.2f\n",value1-value2);    else if(op=='*')         printf("=%.2f\n",value1*value2);    else if(op=='/')        if(value2!=0)            printf("=%.2f\n",value1/value2);           else               printf("divisor can not be 0!\n");    else        printf("unknow operator!\n");            return 0;}