#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=='/')        printf("=%.2f\n",value1/value2);    else        printf("Unknown operation\n");    return 0;}