/******************************************************************** @file Main.cpp @date 2017-05-12 @author Zoro_Tiger @brief 问题 1018: C语言程序设计教程(第三版)课后习题6.8 http://www.dotcpp.com/oj/problem1018.html ********************************************************************/ #include <cstdio> #define TEST #undef TEST int main(int argc, const char* argv[]) { #ifdef TEST freopen("in.txt", "r", stdin); freopen("out.txt", "w", stdout); #endif int number_n = 0; while (scanf("%d", &number_n) != EOF) { double a = 1, b = 2, sum = 0; for (int i = 0; i < number_n; ++i) { sum += b / a; a = a + b; //!a值本身的值被舍弃 //!交换 a = a + b; b = a - b; a = a - b; } printf("%.2lf\n", sum); } return 0; }
时间: 2024-10-10 07:44:19