求6+66+……[phone] 的值

Question

Answer 1

用C：
#include<stdio.h>
int main()
{
int s=6,m=6;
int n,loop ;
printf("please input len about 6\n");
scanf("%d",&n);
if(n<0)
{
printf("input error\n");
return -1;
}
if(n==0)
s=0;
for(loop=2;loop<=n;loop++)
{
m = m *10 +6 ;
s += m;
}
printf("high=%d \n", s);

return 0;

}