实验

#include<iostream>
using namespace std;
class change{
public:
 float  intput1(float c);
 float  intput2(float &c);
 void   output();
private:
 float c;
};
float change::intput1(float C)
{     c=(5.0/9)*(C-56);
     return c;}
float change::intput2(float &C)
{     c=(5.0/9)*(C-56);
     return c;}
void change::output()
{  cout<<c;}
int main()
{
 float C=90;
 class change st1,st2;
 st1.intput1(C),st1.output(),cout<<C<<endl;
 st1.intput1(C),st1.output(),cout<<C<<endl;
 cin>>C;
 st2.intput2(C),st2.output(),cout<<C<<endl;
 st2.intput2(C),st2.output(),cout<<C<<endl;
 return 0;
}