交换变量x与变量y的值

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#include <iostream>
using namespace std;
int main(){
	int x,y,t;
	x=10;
        y=30;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	t=x;
	x=y;
	y=t;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	
	return 0;
}

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#include <iostream>
using namespace std;
int main(){
	int x,y;
	x=10;
        y=30;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	x=x+y;
	y=x-y;
	x=x-y;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	
	return 0;
}

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#include <iostream>
using namespace std;
int main(){
	int x,y;
	x=10;
        y=30;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	x=x-y;
	y=x+y;
	x=y-x;
	cout<<"x="<<x<<" "<<"y="<<y<<endl;
	
	return 0;
}