/*
 * @Author: weibing9456 [email protected]
 * @Date: 2023-10-16 14:40:02
 * @LastEditors: weibing9456 [email protected]
 * @LastEditTime: 2023-10-16 15:20:12
 * @FilePath: \PineConesWebf:\code\cppDemo\pro-blemtest5.c
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 */

#include <stdio.h>
/*输入一个int n,求k(若k=5)项和 n+nn+nnn+nnnn+nnnnn*/
// n代表最后一个项的第一项,必须是奇数
int con(int n, int k)
{
    int result = n;
    for (int i = 1; i < k; i++)
    {
        /* code */
        result = result * 10 + n;
    }
    return result;
}
int fun(int n, int k)
{
    if (k == 1)
        return n;
    return fun(n, k - 1) + con(n, k);
}
int main()
{
    printf("输入一个int n,求k(若k=5)项和 n+nn+nnn+nnnn+nnnnn\n");
    // int result = fun(3);
    int result = fun(2, 3);
    printf("%d", result);
    return 1;
}