编程题

#include <iostream>using namespace std;class Tast{    public:    void init(int a,int b);    void print();    private:    int x;    int y;};void Tast::init(int a,int b)    {        x=a;        y=b;    }void Tast::print()    {        int y1,z;        z=x-y;        y1=-y;        cout<<x<<((y>0)?'-':'+')<<(y>0?y:y1)<<'='<<z<<endl;    }int main(){    Tast a;    a.init(68,55);    a.print();    return 0;}

运行结果：