#include<bits/stdc++.h>usingnamespacestd;classExamInfo{public:ExamInfo(stringname,chargrade):name(name),mode(GRADE),grade(grade){}ExamInfo(stringname,boolpass):name(name),mode(PASS),pass(pass){}ExamInfo(strin

例4-8题目描述：使用联合体保存成绩信息，并且输出代码部分：#include<string>#include<iostream>usingnamespacestd;classExamInfo{private:stringname;enum{GRADE,PASS,PERCENTAGE}mode;union{chargrade;

#include<string>#include<iostream>usingnamespacestd;classExamInfo{ public: ExamInfo(stringname,chargrade) :name(name),mode(GRADE),grade(grade){} ExamInfo(stringname,boolpass) :name(name),mode(PASS),pass(pass){} ExamInfo(stringname