C++:Program Swapping variables

How to swap three nos. without another variable.
let input be a=2,b=3 and c=4
and output=a=4,b=2and c=3
 
#include<iostream>
using namespace std;

int main(){
int a,b,c;
cout<<"Enter three nos."<<endl;
cin>>a>>b>>c;
a=a+b+c; //now a=9
b=a-(b+c); //b=2
c=a-(b+c); //c=3
a=a-(b+c); //a=4
cout<<"a="<<a<<" b="<<b<<" c="<<c;
return 0;
}
This method will not work for large value of integers.
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