25-输入数字和个数计算sn=a+aa+..

#include "stdio.h"#include "conio.h"main(){  int a,n;  long int sn=0,tn=0;  printf("please input a and n\n");  scanf("%d,%d",&a,&n);  printf("a=%d,n=%d\n",a,n);  while(n>=1)  {  tn=a+tn;    sn=tn+sn;    printf("%ld\n",sn);    //扩大10倍 a=a*10;     --n;   }  printf("a+aa+...=%ld\n",sn);  getch();}