C++ Language
#include<iostream.h> #include<conio.h> void main() { int i,j,n,a=1; clrscr(); cout<<"Enter a Number - "<<endl; cin>>n; for(i=1;i<=n;i++) { for(j=1;j<=i;j++) { cout<<a; a++; } cout<<endl; } getch(); } /*OUTPUT*/ Enter a Number - 8 1 23 456 78910 1112131415 161718192021 22232425262728 2930313233343536