a+aa.c

C语言实验作业包

#include<stdio.h>
main()
{ long a,n,i,s=0,y=0;
  printf("Please enter a,n:");
  scanf("%ld,%ld",&a,&n);
  for(i=1;i<=n;i++)
  { y=y+a;
    s=s+y;
    a=a*10;
  }
  printf("sum=%ld\n",s);
}