//求解简单的四则运算表达式

#include<stdio.h>
int main()
{
    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 printf("Unknown operator\n");
    return 0;
}