1326: Heads

1326: Heads

---

Result	TIME Limit	MEMORY Limit	Run Times	AC Times	JUDGE
	3s	8192K	748	280	Standard

The probability of n heads in a row tossing a fair coin is 2^-n

Input

r lines containing each one an integer number n. The values of r and n are as follows: 0< r < 10, .

Output

Print r lines each with the value of 2 ^-n for the given values of n, using the format:

 

2^-n = x.xxxE-y

 

where each x is a decimal digit and each y is a decimal integer with no leading zeroes or spaces.

Sample Input

 

8271
6000
1

Sample Output

 

2^-8271 = 1.517E-2490
2^-6000 = 6.607E-1807
2^-1 = 5.000E-1

#include<stdio.h>
//#include<stdlib.h>
int main()
{
 int n,i;
 while(scanf("%d",&n)==1)
 {
  double x=1;
  int count=0;
  for(i=1;i<=n;i++)
  {
   x/=2;
   if(x<1) {x*=10;count--;}
  }
  printf("2^-%d = %.3lfE%d/n",n,x,count);
 }
// system("pause");
 return 0;
}