补充代码#include<iostream> #include<string> # include"math.h" using namespace std; class Exception { private: string error; public: virtual string getError() { return error; } virtual void setError(string e) { error=e; } virtual string toString() { return error; } Exception(){} }; //在begin和end之间完成Triangle,ZeroException,InputException,NoTriangException类的定义及实现 /begin*/ /****end/ //请勿修改main()函数代码 int main(int argc, char *argv[]) { double t1,t2,t3; cin>>t1>>t2>>t3; try { Triangle tri(t1,t2,t3); cout<<"area="<<tri.area(); }catch(Exception e) { cout<<e.toString(); } }

下面是补充完整的代码，其中包括了Triangle、ZeroException、InputException和NoTriangException类的定义及实现。

#include <iostream>
#include <string>
#include <math.h>

using namespace std;

class Exception {
private:
    string error;
public:
    virtual string getError() {
        return error;
    }
    virtual void setError(string e) {
        error = e;
    }
    virtual string toString() {
        return error;
    }
    Exception() {}
};

class ZeroException : public Exception {
public:
    ZeroException() {
        setError("ZeroException");
    }
};

class InputException : public Exception {
public:
    InputException() {
        setError("InputException");
    }
};

class NoTriangException : public Exception {
public:
    NoTriangException() {
        setError("NoTriangException");
    }
};

class Triangle {
private:
    double a, b, c;
public:
    Triangle(double t1, double t2, double t3) {
        if (t1 <= 0 || t2 <= 0 || t3 <= 0) {
            throw ZeroException();
        }
        if (t1 + t2 <= t3 || t1 + t3 <= t2 || t2 + t3 <= t1) {
            throw NoTriangException();
        }
        a = t1;
        b = t2;
        c = t3;
    }
    double area() {
        double s = (a + b + c) / 2;
        return sqrt(s * (s - a) * (s - b) * (s - c));
    }
};

int main(int argc, char *argv[]) {
    double t1, t2, t3;
    cin >> t1 >> t2 >> t3;
    try {
        Triangle tri(t1, t2, t3);
        cout << "area=" << tri.area();
    }
    catch (Exception e) {
        cout << e.toString();
    }
    return 0;
}