题解 | #求小球落地5次后所经历的路程和第5次反弹的高度#

#include <stdio.h>
#include <string.h>

void test(char *str)                              // 用于去除字符串最后后面的0
{
    int len = strlen(str);
    for (int i = len - 1; i > 0; i--) {
        if (str[i] == '0') {
            str[i] = '\0';
        } else if (str[i] != '0') {
            return;
        }
    }
}

int main() {
    double n;
    scanf("%lf", &n);

    double total_S = 2 * n + n / 2 + n / 4 + n / 8; // 计算总路程
    double end_H = n / 32;                          // 计算最后一次跳跃高度

    char ret_S[10] = {'\0'};
    char ret_H[10] = {'\0'};

    sprintf(ret_S, "%.6f", total_S);                // 转化结果为字符串
    sprintf(ret_H, "%.6f", end_H);

    test(ret_S);
    test(ret_H);

    printf("%s\n", ret_S);
    printf("%s", ret_H);

    return 0;
}