Swap two numbers

PROBLEM :

Swap given two numbers and print them. (Try to do it without a temporary variable.)

Input:
First line contains an integer, the number of test cases 'T'. Each test case should contain two positive numbers a and b.


Output:
Print the 2 numbers after swapping.


Constraints:
1<=T<=30
1<=a<=1000
1<=b<=1000


Example:
Input:
2
20 30
12 32

Output:
30 20
32 12
     
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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
int main()
 {
int no1,no2,t,sum;
cin>>t ;
while(t--)
{
   cin>>no1>>no2 ;
   sum=no1+no2 ;
   no1=sum-no1 ;
   no2=sum-no1 ;
 
   cout<<no1<<" "<<no2 ;
   cout<<endl ;
}
return 0;
}

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