Треугольник задается координатами своих вершин. С++

#include <iostream>
using namespace std;
int ygol (float a, float b, float c)
{
float cos=(a*a+b*b-c*c); 
if(cos>=0) cos=0;
return cos;
}
int main ()
{
float a[3], b[3], c[3];int k;
float max=-10,maxt=0;
cout«"kollichestvo treugolnikov:";
cin»k;
for (int i=1; i<=k; i++)
{ cout«"treygolnik N"«i«" \n";
for (int j=0; j<3; j++)
{
cout«"Vershini:";
cin»a[i]»b[i]»c[i];
}
float ab, bc,ca, kk;
ab=sqrt((b[0]-a[0])*(b[0]-a[0])+(b[1]-a[1])*(b[1]-a[1])+(b[2]-a[2])*(b[2]-a[2]));
bc=sqrt((b[0]-c[0])*(b[0]-c[0])+(b[1]-c[1])*(b[1]-c[1])+(b[2]-c[2])*(b[2]-c[2]));
ca=sqrt((c[0]-a[0])*(c[0]-a[0])+(c[1]-a[1])*(c[1]-a[1])+(c[2]-a[2])*(c[2]-a[2]));
if (ab>ca)
{
kk=ca; ca=ab; ab=kk;
}
if (bc>ca)
{
kk=ca; ca=bc; bc=kk;
}
float g=ygol(ab, bc, ca);
if (g<0) if(g>max) { max=g; maxt=i;}
}
if (maxt>0)
cout«maxt;
else cout«"Tupikh uglov net"«endl;
system ("Pause");
return 0;
}

if(cos>=0) cos=0;

ab=sqrt((b[0]-a[0])*(b[0]-a[0])+(b[1]-a[1])*(b[1]-a[1])+(b[2]-a[2])*(b[2]-a[2]));
bc=sqrt((b[0]-c[0])*(b[0]-c[0])+(b[1]-c[1])*(b[1]-c[1])+(b[2]-c[2])*(b[2]-c[2]));
ca=sqrt((c[0]-a[0])*(c[0]-a[0])+(c[1]-a[1])*(c[1]-a[1])+(c[2]-a[2])*(c[2]-a[2]));