TRIANGLE OF NUMBERS

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int n;

 cout<<"enter the number of lines :";

 cin>>n;

 for(int i=1 ; i<=n ; i++)

 {

   for(int j=1; j<=i ; j++)

     cout<<(0+j);

   cout<<"\n";

 }

 getch();

}

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OUTPUT :(click to enlarge the image)