一球从100m高度自由落下，每次落地后反跳回原高度的一半，再落下。求它在第n次落地时，共经过多少米？第n次反弹多高？（小数点后保留5位）

#include<stdio.h>
int main()
{
int n;
float height = 100, b, first = 200, i, sum = 100;
scanf("%d", &n);
for (i = 1; i < n; i++) {
sum = sum + first / 2;
first = first / 2;
}
for (i = 0; i < n; i++)
height = height / 2;
printf("共经过%.5f米\n", sum);
printf("第n次反弹%.5f米\n", height);

}