c语言怎么用switch语句编写四则运算?答:switch(Operation){ case '+':printf("%lf%c%lf=%lf",N1,N2,Operation,N1+N2);break;case '-':printf("%lf%c%lf=%lf",N1,N2,Operation,N1-N2);break;case '*':printf("%lf%c%lf=%lf",N1,N2,Operation,N1*N2);break;case '/':printf("%lf%c%lf=%lf",N1,N2,Operation,N1...