23. //to print first n natural numbers and their sum #include<iostream.h> #include<conio.h> void main () { clrscr (); int n , sum =0 ; cout << “Enter the value of n: ” ; cin >> n ; cout << “First “ << n << “ natural numbers are:” ; for ( i = 1 ; i <= n ;++ i ) { cout << i << ‘ ‘ ; sum += i ; } cout << “Sum = “ << sum ; getch (); }