同swustoj 11

Billiard

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 1362		Accepted: 842

In a billiard table with horizontal side a inches and vertical side b inches, a ball is launched from the middle of the table. After s > 0 seconds the ball returns to the point from which it was launched, after having made m bounces off the vertical sides and n bounces off the horizontal sides of the table. Find the launching angle A (measured from the horizontal), which will be between 0 and 90 degrees inclusive, and the initial velocity of the ball. 
Assume that the collisions with a side are elastic (no energy loss), and thus the velocity component of the ball parallel to each side remains unchanged. Also, assume the ball has a radius of zero. Remember that, unlike pool tables, billiard tables have no pockets. 

Input consists of a sequence of lines, each containing five nonnegative integers separated by whitespace. The five numbers are: a, b, s, m, and n, respectively. All numbers are positive integers not greater than 10000. 
Input is terminated by a line containing five zeroes. 

For each input line except the last, output a line containing two real numbers (accurate to two decimal places) separated by a single space. The first number is the measure of the angle A in degrees and the second is the velocity of the ball measured in inches per second, according to the description above.

100 100 1 1 1

200 100 5 3 4

201 132 48 1900 156

0 0 0 0 0

45.00 141.42

33.69 144.22

3.09 7967.81

#include<iostream>

#include<algorithm>

#include<cstdio>

#include<cmath>

#include<cstring>

using namespace std;

#define INF 0x3f3f3f3f

#define PI acos(-1.0)

int main()

{

    int n,m;

    double a,b,s;

    while(scanf("%lf%lf%lf%d%d",&a,&b,&s,&m,&n)!=EOF)

    {

        if(a+b+s+m+n==) break;

       double angel=atan2(b*n,a*m)*/PI;

       double v=sqrt(a*a*m*m+b*b*n*n)/s;

       printf("%.2f %.2f\n",angel,v);

    }

    return ;

}