C++——try、throw、catch实例学习程序

#include<iostream>#include<stdexcept>//exception/stdexcept/new/type_info头文件中都有定义的标准异常类using namespace std;int main(){      try{            int a,b;    char s;            cin>>a>>s>>b;            if(s=='/'){                  if(b==0)  throw "Divided by 0!";                  cout<<a<<"/"<<b<<"="<<a/b<<endl;            }            else                  if(s=='%') {                           if(b==0)      throw a;                        cout<<a<<"%"<<b<<"="<<a%b<<endl;                  }                  else                        cout<<"Option must be % or /."<<endl;      }//try      //捕获int类型的异常并处理      catch(int i)  {       cout<<"Error occur:"<<i<<"%0"<<endl;  }      //捕获char* 类型的异常并处理      catch(char *str) {cout<<"Error occur:"<<str<<endl;  }      catch(runtime_error err){ cout<<err.what()<<endl;}      //捕获其它任何异常并处理      catch(...){cout<<"Unkown Error"<<endl;}      //没错误不运行catch，有错误至多运行一个catch语句块，且不再返回try语句块中。      //不管有无异常都要运行到此处      cout<<"Hello world"<<endl;      return 0;}