计算2+22+222+2222+22222类的代码，有兴趣的进来看看哦

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
int a, Sn, b, i;
scanf("%d", &a);
b = 0;
Sn = 0;
for (i = 0; i < 5 ; i++)
{
b = b * 10 + a;
Sn = Sn + b;
}
printf("%d\n", Sn);
/b = a * 10 + a;
c = b * 10 + a;
d = c * 10 + a;
e = d * 10 + a;/
system(“pause”);
return 0;
}