#include<stdio.h>int main(){?? ?long term=0,sum=0;?? ?int a,i,n;?? ?printf("Input a,n:");?? ?scanf("%d,%d", &a, &n);?? ?for(i=1; i<=n; i++)?? ?{?? ??? ?term = term * 10 + a;?? ??? ?sum += term;?? ?}?? ?printf("sum=%ld\n",sum);?? ?return 0;}