C :

#include<stdio.h>
int main()
{
	int n,i;
	double length=100,high=length/2;
	scanf("%d",&n);
	for(i=2;i<=n;i++)
	{
		length=length+2*high;
		high=high/2;
	}
	printf("length=%3.4f\nhigh=%1.4f\n",length,high);
	
	return 0;
}

C++ :

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	int n;
	cin>>n;
	double h=100,sum=0;
	for (int i=1; i<=n; i++)
	{
		sum+=2*h;
		h/=2;
	}
	printf("length=%.4lf\nhigh=%.4lf\n",sum-100,h);
	return 0;
}