题目链接： 习题6-2 使用函数求特殊a串数列和 (20分)
#include <stdio.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 i
,s
=0;
for(i
=1;i
<=n
;i
++){
s
=s
*10+a
;
}
return s
;
}
int SumA( int a
, int n
){
int i
,s
=0;
for(i
=1;i
<=n
;i
++){
s
=s
+fn(a
,i
);
}
return s
;
}
