【C语】例如2+22+222+2222+22222此式的和

define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
int main()
{
int a ;
int sum = 0;
int i;
scanf("%d", &a);
for (i = 0; i <= 4; i++)
{
sum = sum + a;
a = a * 10 + 2;

}
printf("%d", sum);
system(“pause”);
return 0;
}