异常处理例题.doc

C+异常处理Eg1：在函数中抛出异常#includeusing namespace std;#define MAX 10int f(int * a,int j) if(j=0&jMAX) return(aj); else throw aaaa;void main() int aMAX=0;trycoutf(a,15)endl;catch(char * s)coutsendl;Eg2：在成员函数种抛出异常：#includeusing namespace std;class StudentDeptpublic: static int Max; StudentDept(char *p) Name=new charMax; strcpy(Name,p); NameMax=0; char p(int i)if(i=0&iMax) return(Namei); else throw cccc;private: char * Name;int StudentDept:Max=20;class Studentpublic: Student(int i,char *j):Dept(j)id=i; StudentDept & q()return(Dept);private: int id; StudentDept Dept;void main() Student a(1,Computer); trycouta.q().p(5); catch(char * m) coutmendl; Eg3#includeusing namespace std;double Div(double, double );void main() try/如果发生异常则只中断try里面的块 cout 7.3/2.0= Div(7.3, 2.0) endl; cout 7.3/0.0= Div(7.3, 0.0) endl; cout 7.3/1.0= Div(7.3, 1.0) endl; catch(double)/try和catch必须相连/参数可以省略但是类型不能省略；建议不要使用简单类型 cout except of deviding zero.n; cout That is ok. n;double Div(double a, double b) if(b=0.0) throw b;/ Throw和catch可以跨函数 return a/b;Eg4：多种异常处理#includeusing namespace std;double Div(double, double );void f()try cout 7.3/2.0= Div(7.3, 2.0) endl; cout 7.3/0.0= Div(7.3, 0.0) endl; cout 7.3/1.0= Div(7.3, 1.0) endl; catch(double)coutdoubleendl;throw a; catch(char)coutcharendl;void g()try f(); catch(char)coutgggggendl;void main() try g(); cout 正确执行完毕. n; catch(int) cout 零做除数错误n; catch(.) cout缺省异常endl;/默认异常处理 cout异常处理完毕endl;double Div(double a, double b) if(b=0.0) throw b; return a/b;Eg5：异常处理和析构#includeusing namespace std;class Apublic:A()A()couterase A object.endl;private:int k;void f()A s;throw 5;coutf() doingendl;void main()tryf();catch(int)coutf() errorendl;/ 的析构函数被调用;异常不处理时不会调用结果：erase A object.f() errorPress any key to continuel Catch对象类型的错误Eg：#includeusing namespace std;class apublic:a(char * net)strcpy(this-net,net);private:char net10;class b:public apublic:b(long card,char * net):a(net)this-card=card;private:long card;class c:public apublic:c(int port,char * net):a(net)this-port=port;private:int port;void net() throw b(1,aaa);void main() trynet();catch(c)cout端口错误;catch(b)cout网卡错误;catch(a)cout网络错误; /注意，基类