Wuhan University of Science and Technology Acm:1004:c Language Programming Tutorial (third Edition) after class exercise 6.3

Problem Description

Beg sn=2+22+222+...+22 ... A value of 222 (with N 2). For example: 2+22+222+2222+22222 (n=5), n is entered by the keyboard.

Input

N

Output

And

Sample Input

5

Sample Output

24690

My Code:

1#include <stdio.h>2 voidMain ()3 {4     intN,a=2, t,sum=0, I;5scanf"%d",&n);6t=A;7      for(i=1; i<=n;i++)8     {9sum=sum+T;Tent=t*Ten+A; One     } Aprintf"%d", sum); -}

Other code:

1#include <iostream>2 3 using namespacestd;4 5 intMain ()6 {7    Longsum=0;8    intt=2;9    intN;TenCin>>N; One     for(intI=0; i<n;++i) A    { -Sum + =T; -t =Ten*t+2; the    } -cout<<sum<<Endl; -     return 0; -}

Wuhan University of Science and Technology Acm:1004:c Language Programming Tutorial (third Edition) after class exercise 6.3