2021-01-13

C++
sn=a+aa+aaa…

#include <stdio.h>
int main()
{
	int i,a,n,sn1=0,sn2=0,d=1,an;
	printf("请输入a与n的值");
	scanf_s("%d,%d",& a ,& n);
	for (i = 1; i <= n; i++)
	{
		sn1 = sn1 + d;
		sn2 = sn2 + sn1;
		d = 10 * d;
	}
	an = a * sn2;
	printf("答案是:%d", an);
	return 0;
}