C++primer plus第六版课后编程题答案8.3

8.3

#include <iostream>
#include <cctype>
#include<string>
using namespace std;
const int MAX=50;
void change(string &s);
void main83()
{
string s="chenggSHIguang";
//char ch='\0';
change(s);
while(s!="q"&&(s.length()!=1))
{
cout<<"Next string (q to quit):"<<endl;
getline(cin,s);
change(s);
}
cout<<"Bye"<<endl;
//cin.get();
system("pause");

}
void change(string &s)
{
int size=s.length();

cout<<s<<"\nsize="<<size<<endl;
//char ch;
for(int i=0;i<size;i++)
{
//cout<<"i="<<i<<"\nsi="<<s[i]<<endl;
s[i]=toupper(s[i]);
}
cout<<s<<endl;

}

我在DEV c++里面却不会出问题，实在是不知道为什么这么神奇

下面是我在DEV c里面测试的源代码

#include<iostream>
#include <string>//出问题时，使用的是cstring,但换成string一样出问题
using namespace std;
struct stringy{
char *str;
int ct;
};
void set(stringy &beany,const char t[]);
void show(const stringy &beany,int count=0);
int main()
{
stringy beany;
char testing[]="Reality isn't what it used to be.";
//char testing[]="Reality";//what it used to be.";
set(beany,testing);
show(beany);
show(beany,2);

if(beany.str!=NULL) //总会引起中断，说是堆损坏
{
delete []beany.str;
cout<<"no null"<<endl;
}
else
cout<<"str is null";

system("pause");

}

void set(stringy &beany,const char t[])
{
//delete beany.str;
int size=sizeof(t);//这里出了问题，长度测试错误,当长度超过八个字符是，直接出错！
cout<<"size="<<size<<endl;
beany.str=new char[size+1];
strcpy(beany.str,t);
int sizeofStr=sizeof(beany.str);
cout<<"Sizeofstr="<<sizeofStr<<endl;
beany.ct=size;
}
void show(const stringy &beany,int count)
{
cout<<"Stringy show"<<endl;
if(count!=0)
{
for(int j=0;j<count;j++)
{
//cout<<"in stringy here!"<<j<<endl;
//cout<<"Stringy show"<<j<<endl;
cout<<"str="<<beany.str<<endl;
};
}
else
cout<<"str="<<beany.str<<endl;

}