BUG之路——14.11.11关于指针

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<pre name="code" class="cpp">//《C++教程》郑莉、李宁，人民邮电出版社，2010第一版

//第五章 抽象与分类//简单的学生信息系统，有录入、查询、输出功能

//BUG：<span style="font-family: Arial, Helvetica, sans-serif;"> </span>

#include "stdafx.h"#include<iostream>#include<string>using namespace std;class Student{private:string strName;//姓名unsigned long nIndex;//学号int nScore;//成绩public:Student(string _name="somebody",unsigned long _index=2008010001,int _score=100):strName(_name),nIndex(_index),nScore(_score){}//构造函数初始化列表~Student(){}string getName();unsigned long getIndex();int getScore();void setName(string strNameNew);void setIndex(unsigned long nIndexNew);void setScore(int nScoreNew);};string Student::getName(){return strName;}unsigned long Student::getIndex(){return nIndex;}int Student::getScore(){return nScore;}void Student::setName(string strNameNew){strName = strNameNew;}void Student::setIndex(unsigned long nIndexNew){nIndex = nIndexNew;}void Student::setScore(int nScoreNew){nScore = nScoreNew;}

//遍历查询函数void Query(bool &flag,Student *sList,int size){unsigned long index;unsigned long num;char yOrN;bool isFound = false;cout<<"请输入要查询的学生学号：";cin>>index;for (int i = 0;i<size;i++){num = sList[i].getIndex();if (num == index){cout<<"姓名："<<sList[i].getName()<<endl;cout<<"学号："<<sList[i].getIndex()<<endl;cout<<"成绩："<<sList[i].getScore()<<endl;isFound = true;break;}}if (!isFound){cout<<"该学号信息不存在！"<<endl;}cout<<"是否继续查询？（y/n）：";cin>>yOrN;if (yOrN == 'y'||yOrN == 'Y'){flag = true;}if (yOrN == 'n'||yOrN == 'N'){flag = false;}}//输出函数void printAll(Student *sList,int size){for (int i=0;i<size;i++){cout<<"姓名："<<sList[i].getName();cout<<"\t学号："<<sList[i].getIndex();cout<<"\t成绩："<<sList[i].getScore()<<endl;}}int main(int argc, char* argv[]){Student *sList;int size;//要录入信息的学生个数string _name;unsigned long _index;int _score;cout<<"请输入学生总数：";cin>>size;<span style="color:#ff0000;">sList = new Student[size];//BUG:一开始没有这句，所以运行起来后提示的错误信息是"The variable 'sList' is being used without being initialized"</span>for (int i=0;i<size;i++){cout<<"学生姓名：";cin>>_name;cout<<"学生学号：";cin>>_index;cout<<"学生分数："; cin>>_score;sList[i] = Student(_name,_index,_score);}bool flag = false;char YorN;cout<<"是否进行查询？(y/n)：";cin>>YorN;if (YorN == 'y'||YorN == 'Y'){flag = true;}while (flag){Query(flag,sList,size);}cout<<"------------------------"<<endl;//当查询结束，自动打印出所有学生信息cout<<"所有学生数据"<<endl;printAll(sList,size);return 0;}

唉，指针不初始化就不能用，犯了多少次还是会出这种弱智错误，我真是个傻X……╭(╯^╰)╮。谨记于此，以备后忘。

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