在百度知道里面得到了正確的答案

http://zhidao.baidu.com/question/198940026560129285.html?quesup2&oldq=1

#include<iostream> #include <string>//出問題時，使用的是cstring,但換成string一樣出問題 using namespace std; struct stringy{char *str;int ct; }; void set(stringy &beany,const char t[]); void show(const stringy &beany,int count=0); void show(const char t[],int count=0); void main84() {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);testing[0]='D';testing[1]='u';show(testing);show(testing,3);show("Done!");cout<<beany.str<<endl;cout<<"here is in"<<endl;if(beany.str!=NULL) //總會引起中斷，說是堆損壞{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=strlen(t);//在這里，t已經退化成了一個指針，不能用sizeof獲取長度！！！int size=sizeof(t);//這里出了問題，長度測試錯誤,當長度超過八個字符是，直接出錯！cout<<"size="<<size<<endl;beany.str=new char[size+1];strcpy(beany.str,t);int sizeofStr=strlen(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;};}elsecout<<"str="<<beany.str<<endl;} void show(const char t[],int count) {cout<<"Testing show:"<<endl;if(count==0)cout<<"str="<<t<<endl;elsefor(int i=0;i<count;i++){cout<<"Testing show:"<<i<<endl;cout<<"str="<<t<<endl;}}

轉載于:https://www.cnblogs.com/qq84435/p/3664871.html

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