实验6-3 使用函数求特殊a串数列和 (20分)

#include <stdio.h>
 #include<math.h>
 int fn( int a, int n );
 int SumA( int a, int n );
 int main()
 {
     int a, n;
     scanf("%d %d", &a, &n);
     printf("fn(%d, %d) = %d\n", a, n, fn(a,n));  
     printf("s = %d\n", SumA(a,n)); 
     return 0;
 }
 int fn( int a, int n )
 {
int sum=0,i,b=1;
for(i=0;i<n;i++)
{
//b=b*10;
sum=sum+a*b;
b=b*10;
}
return sum;
 }
 int SumA( int a, int n )
 {
int sum1=0,sum2,i;
for(i=1;i<n+1;i++)
{
sum2=fn(a,i);
sum1=sum1+sum2;

}
return  sum1;


 }