C语言计算a+aa+aaa+...(n个a)的值

#include<stdio.h>
int main(){
	int n,a,sum,term,i;
	printf("请输入n和a的值:");
	scanf("%d %d",&n,&a);
	term=a;
	sum=0;
	for(i=0;i<n;i++){
		sum+=term;
		term=term*10+a;
	}
	printf("%d\n",sum);
}