#include "iostream.h"void main(void){ float fun(float e,char f,float g);//声明函数原型 float a,b,c,d; char oper1,oper2; cout<<"请输入一个表达式（eg.1+2*3）:"<<endl; cin>>a>>oper1>>b>>oper2>>c; //根据"+,-,*,/"运算符号优先级分2种情况 //情况1; if((oper1=='*')||(oper1=='/')) { d=fun(a,oper1,b); d=fun(d,oper2,c); ...