poj 2208 Pyramids

#include<stdio.h>#include<math.h>int main(){    double p,q,r,n,m,l;    while(scanf("%lf%lf%lf%lf%lf%lf",&p,&q,&r,&n,&m,&l)!=EOF)    {        double tmp1=(p*p+q*q-n*n)/2;        double tmp2=(p*p+r*r-m*m)/2;        double tmp3=(q*q+r*r-l*l)/2;        double M1=q*q*r*r-tmp3*tmp3;        double M2=r*r*tmp1-tmp2*tmp3;        double M3=tmp1*tmp3-q*q*tmp2;        double V=sqrt(p*p*M1-tmp1*M2+tmp2*M3);        V/=6.0;        printf("%.4lfn",V);    }        return 0;}