C++primer plus第六版课后编程题答案
8.4
这道题有个BUG,我暂时还是无法解决,谁解决的麻烦告诉下我
#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); 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) //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; } void show(const char t[],int count) { cout<<"Testing show:"<<endl; if(count==0) cout<<"str="<<t<<endl; else for(int i=0;i<count;i++) { cout<<"Testing show:"<<i<<endl; cout<<"str="<<t<<endl; } }