Go: package main

import (
	"fmt"
	"math"
)

func main() {
	var n int
	fmt.Scan(&n)
	for i := 0; i < n; i++ {
		var xa, ya, ra, xb, yb, rb float64
		fmt.Scan(&xa, &ya, &ra, &xb, &yb, &rb)
		// println(xa, ya, ra, xb, yb, rb)
		dis := math.Sqrt((xa-xb)*(xa-xb) + (ya-yb)*(ya-yb))
		if dis + ra < rb {
			fmt.Println(-2)
		} else if dis + rb < ra {
			fmt.Println(2)
		} else if dis > rb + ra {
			fmt.Println(0)
		} else {
			fmt.Println(1)
		}
	}
}

C++: //include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <queue>
#include <iterator>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}

//math
//-------------------------------------------
template<class T> inline T sqr(T x) {return x*x;}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef unsigned long long ULL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI  = acos(-1.0);

//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))

//debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

int gcd(int a, int b){
   int tmp;
   while(a%b==0){
      tmp=a%b;
      a=b;
      b=tmp;
   }
}

int lcm(int a,int b){
   return a*b/gcd(a,b);
}

bool prime_number(int n){
   if(n < 2){
      return false;
   }
   else if(n == 2){
      return true;
   }
   if(n % 2 == 0){
      return false;
   }
   for(int i=3;i<=n/i;i+=2){
      if(n % i == 0) return false;
      return true;
   }
}

int main(){
   int n;
   double x[2],y[2],r[2];
   cin>>n;
   REP(i,n){
      REP(j,2) cin >> x[j] >> y[j] >> r[j];
      if(sqrt(pow(x[1]-x[0],2)+pow(y[1]-y[0],2))>r[1]+r[0])
         cout << "0" << endl;
      else if(sqrt(pow(x[1]-x[0],2)+pow(y[1]-y[0],2))<r[0]&&
      sqrt(pow(x[1]-x[0],2)+pow(y[1]-y[0],2))>r[1])
         cout << "2" << endl;
      else if(sqrt(pow(x[1]-x[0],2)+pow(y[1]-y[0],2))<r[1]&&
      sqrt(pow(x[1]-x[0],2)+pow(y[1]-y[0],2))>r[0])
         cout << "-2" << endl;
      else cout << "1" << endl;
   }
}

C++: #include <stdio.h>
#include <math.h>
  int main(){
    int n,i;
    double xa,ya,ra,xb,yb,rb;
    scanf("%d",&n);
     for(i=0;i<n;i++){
       scanf("%lf%lf%lf%lf%lf%lf",&xa,&ya,&ra,&xb,&yb,&rb);
       double dis=(xa-xb)*(xa-xb)+(ya-yb)*(ya-yb);   
       dis = sqrt(dis);
       if(dis>ra+rb){
printf("%d\n",0);
continue;
}else if(dis<=ra+rb && dis>fabs(ra-rb)){
printf("%d\n",1);
continue;
}else if(ra>rb){
printf("%d\n",2);
continue;
}else{
printf("%d\n",-2);
continue;
}  
}
return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<(n); ++i)

int main(void){
    int n;
    double x[2], y[2], r[2];
    cin >> n;
    rep(data, n) {
        rep(i, 2) cin >> x[i] >> y[i] >> r[i];
        double dist = sqrt(pow(y[1]-y[0], 2.0) + pow(x[1]-x[0], 2.0));
        if (dist < r[1]-r[2]) cout << 2 << endl;
        else if(dist < r[2]-r[1]) cout << -2 << endl;
        else if(dist < r[2]+r[1]) cout << 1 << endl;
        else cout << 0 << endl;
    }
}

C++: #include <iostream>
#include <cmath>
using namespace std;

int main(){
  int n;
  cin>>n;
  double xa,ya,ra,xb,yb,rb;
  while(cin>>xa>>ya>>ra>>xb>>yb>>rb){
    double r;
    r = sqrt((xa-xb)*(xa-xb)+(ya-yb)*(ya-yb));
    if(r+rb<ra) cout<<"2"<<endl;
    else if(r+ra<rb) cout<<"-2"<<endl;
    else if(r>ra+rb) cout<<"0"<<endl;
    else cout<<"1"<<endl;
  }
  return 0;
}

C++: #include <iostream>
#include <array>

inline double squ_minus(double a, double b){
	double x = a - b;
	return x * x;
}

inline double squ_plus(double a, double b){
	double x = a + b;
	return x * x;
}

int main(){
	int n; // the number of datasets
	cin >> n;
	
	for(int i = 0; i < n; i++){
		std::array<double, 6> cir; // 0:xa, 1:ya, 2:ra, 3:xb, 4:yb, 5:rb
		cin >> cir[0] >> cir[1] >> cir[2] >> cir[3] >> cir[4] >> cir[5];

		double dis = squ_minus(cir[0], cir[3]) + squ_mins(cir[1], cir[4]);
		
		if(dis > squ_plus(cir[2], cir[5]){
			std::cout << "0" << std::endl;
		}else if(dis < squ_minus(cir[2], cir[5])){
			std::cout << (cir[2] > cir[5]) ? "2" : "-2" << std::endl;
		}else{
			std::cout << "1" << std::endl;
		}
	}
	return 0;
}

C++: #include <iostream>
#include <cmath>
using namespace std;

float d(float x, float y, float z, float w){
	float ret;
	ret = pow(x - z, 2) + pow(y - w, 2);
	return sqrtf(ret);
}

int main(){
	int n;
	float x[2], y[2], r[2], dd;
	cin >> n;
	for(int i = 0;i<n;i++){
		cin >> x[0] >> y[0] >> r[0] >> x[1] >> y[1] >> r[1];
		dd = d(x[0], y[0], x[1], y[1]);
		if(dd>r[0]+r[1]){
			cout << 0 << endl;
		}
		else if(dd + r[0] <= r[1]){
			cout << -2 << endl;
		}
		else if (dd + r[1] <= r[0]) {
			cout << 2 << endl;
		}
		else {
			cout << 1 << endl;
		}
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <cmath>

inline float distance(float xa, float ya, float xb, float yb){
	return std::sqrt(pow(xa - xb, 2) + pow(ya - yb, 2));
}

int judge(std::vector<float> ve){
	float center_dis = distance(ve[0], ve[1], ve[3], ve[4]);
	if(center_dis > ve[2] + ve[5]){
		return 0;	
	}else if(ve[2] > center_dis + ve[5]){
		return 2;
	}else if(ve[5] > center_dis + ve[2]){
		return -2;
	}else{
		return 1;
	}
}

int main(void){
	int num;
	std::vector<float> ve(6);

	std::cin >> num;

	for(int i = 0; i < num; ++i){
		std::cin >> ve[0] >> ve[1] >> ve[2] >> ve[3] >> ve[4] >> ve[5];
		
		std::cout << judge(ve) << std::endl;
	}
	return 0;
}

C++: #include <iostream>
#include <math.h>
#include <stdio.h>
using namespace std;

double r(double x1,double y1,double x2,double y2){
	return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
	
	}

int main() {
	// your code goes here
	int n;
	double x1,x2,y1,y2,r1,r2;
	cin>>n;
	for(int j=0;j<n;j++){
		cin>>x1>>y1>>r1>>x2>>y2>>r2;
		
		if(r(x1,y1,x2,y2)>(r1+r2)){
			cout<<0<<endl;
		}
		else if(r(x1,y1,x2,y2)>=fabs(r1-r2)&&r(x1,y1,x2,y2)=<r1+r2){
			cout<<1<<endl;
		}
		else if(r1>r2){
			cout<<2<<endl;
		}
		else if(r2>r1){
		cout<<-2<<endl;	
		
		}
		
		
	}
	
	return 0;
}

C++: #include<cstdio>
#include<cmath>
#include<iostream>
#include<algorithm>
using namespace std;
int main(void){
  int n;
  scanf("%d",&n);
  for(int i=0;i<n;i++){
    double x[2],y[2],r[2],h;
    for(int j=0;j<2;j++) scanf("%lf %lf %lf",&x[j],&y[j],&r[j]);
    h=hypot(abs(x[0]-x[1]),abs(y[0]-y[1]));
    if(h+r[1]<r[0]) puts("2");
    else if(h+r[0]<r[1]) puts("-2");
    else if(h<=r[0]+r[1]) puts("1");
    else puts("0");
  }
}