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C语言相关程序

#include<iostream.h>
class sample
{
	int n;
public:
	sample(){}
	sample(int m){n=m;}
	sample add(sample s1,sample s2)
	{
		this->n=s1.n+s2.n;
		return(*this);
	}
	void disp()
	{
		cout<<"n="<<n<<endl;
	}
};
void main()
{
sample s1(10),s2(5),s3;
cout<<"s1: ";
s1.disp();
cout<<"s2: ";
s2.disp();
s3.add(s1,s2);
cout<<"s3: ";
s3.disp();

}