习题6-2 使用函数求特殊a串数列和

 #include <stdio.h>

 int fn(int a, int n);
 int SumA(int a, int n);

 int main()
 {
     int a, n;

     scanf_s("%d %d", &a, &n);
     printf("fn(%d, %d) = %d\n", a, n, fn(a, n));
     printf("s = %d\n", SumA(a, n));

     return ;
 }

 /* 你的代码将被嵌在这里 */
 int fn(int a, int n)
 {
     int number = ;
     for (int i = ; i < n; i++)
     {
         number = number *  + a;
     }

     return number;
 }

 int SumA(int a, int n)
 {
     int sum = ;
     for (int i = ; i <= n; i++)
     {
         sum = sum + fn(a, i);
     }

     return sum;
 }