Find the value of S=A+AA+AAA+AAAA+AA...A (where A is a number)

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Topic:

Find the value of S=A+AA+AAA+AAAA+AA...A, where a is a number. For example 2+22+222+2222+22222 (there are 5 numbers added at this time), several numbers are added with keyboard control.

1. Procedure analysis: The key is to calculate the value of each item.

2. Program Source code:

#include "stdio.h"
#include "conio.h"
Main ()
{
  int a,n,count=1;
  long int sn=0,tn=0;
  printf ("Please input A and n\n");
  scanf ("%d,%d", &a,&n);
  printf ("a=%d,n=%d\n", a,n);
  while (count<=n)
  {
    Tn=tn+a;
    Sn=sn+tn;
    a=a*10;
    ++count;
  }
  printf ("a+aa+...=%ld\n", SN);
  Getch ();
}

3.Visual C + + 6.0 debugging pass, as shown in figure: