C＋＋问题 描述 已知三元一次方程ax+by+cz=d中a、b、c、d的值，按数学的书写风格？

#include<iostream>
using namespace std;
int main()
{
int a,b,c,d;

cin>>a>>b>>c>>d;

if(a==1)
cout<<"x";
else if(a==-1)
cout<<"-x";
else if(a!=0)
cout<<a<<"x";

if(b==1)
{
if(a!=0)
cout<<"+y";
else
cout<<"y";
}
else if(b==-1)
cout<<"-y";
else if(b>0)
{
if(a!=0)
cout<<"+"<<b<<"y";
else
cout<<b<<"y";
}
else if(b<0)
cout<<b<<"y";

if(c==1)
{
if(a!=0||b!=0)
cout<<"+z";
else
cout<<"z";
}
else if(c==-1)
cout<<"-z";
else if(c>0)
{
if(a!=0||b!=0)
cout<<"+"<<c<<"z";
else
cout<<c<<"z";
}
else if(c<0)
cout<<c<<"z";

cout<<"="<<d<<endl;

return 0;
}

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