数学H - The Land of Justice

因为看到输出这边是50

所以想用类型转换再用%d 各种过不去

改了%.0lf就过了

#include <stdio.h>
#include <math.h>
#define pi 3.14

int main(){
double area = 4 * pi, area2,  n;
while (scanf ("%lf", &n) != EOF && n >= 0) {
if (n <=1)
printf("0%%\n");
else {
area2 = n * pi / area;
printf("%.0lf%%\n", area2 * 100);
}
}
return 0;
}

In the Land of Justice the selling price of everything is xed all over the country. Nobody can buy

a thing and sell it in double price. But, that created problems for the businessmen. They left their

business and went to the production. So, after some days everybody was in production and nobody

in business. And the people didn't get their necessary things though the country was self-sufficient in

every sector.

The government became very much anxious. But, they were intelligent enough to call the mathe-

maticians.

The mathematicians gave a solution. They suggested setting the surface area of an object as its

selling-unit instead of its volume. Actually the clever mathematicians were very much interested to

establish their own business.

Now, the government asks the programmers to build the software that would calculate the pro t

things.

Here your job is to calculate the business pro t for a solid sphere. A businessman buys a complete

sphere and to maximize his pro t he divides it in

n

equal parts. All cut should go through the axis of

the sphere. And every part should look like the picture below:

Input

You are given a sequence of integers

N

(0

<N<

2

31

), indicating the numbers of parts of the sphere.

The input le is terminated with a negative number. This number should not be processed.

Output

Calculate the pro t over the sold pieces. The result should be in percentage and rounded to the nearest

integer.

SampleInput

2

2

-1

SampleOutput

50%

50%