fork download
copy 
  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.   int i, j, n;
  8.  
  9.   // read n from the user
  10.  
  11.   cin >> n;
  12.  
  13.   // print out all pairs of natural numbers
  14.   // a,b <= n, such that a<b
  15.  
  16.   for (i=1; i<n; i++)
  17.     for (j=i+1; j<=n; j++)
  18.       cout << i << " " << j << endl;
  19.  
  20.   return 0;
  21. }
Success #stdin #stdout 0.01s 2728KB
comments (?)
stdin
copy 
5
stdout
copy 
1 2
1 3
1 4
1 5
2 3
2 4
2 5
3 4
3 5
4 5
https://ideone.com/pgJXJ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!