1156 S Sequence II

URI Online Judge | 1156

S Sequence II

Write an algorithm to calculate and write the value of S, S being given by:
S = 1 + 3/2 + 5/4 + 7/8 + ... + 39/?

Input

There is no input in this problem.

Output

The output contains a value corresponding to the value of S.
The value should be printed with two digits after the decimal point.

Input Sample	Output Sample

 Solution:

#include <stdio.h> int main() {     double i,b=1,c, S=0;     for(i=1; i<=39; i+=2)     {         c=i/b;         S+=c;         b*=2;     }     printf("%.2lf\n",S);     return 0; }