http://www.acmicpc.net/problem/1002

#include <stdio.h>
#include <math.h>

inline int squa(int a)
{
return a * a;
}

int main(void)
{
int x1, x2, y1, y2, r1, r2;
int distance;

int num[100];
int i, j;

scanf("%d", &i);

for(j=0; j<i; j++)
{
scanf("%d %d %d %d %d %d", &x1, &x2, &r1, &y1, &y2, &r2);

while(1)
{
if(x1 < -10000 || x1 > 10000 || x2 < -10000 || x2 > 10000 || y1 < -10000 || y1 > 10000 || y2 < -10000 || y2 > 10000 || r1 < 0 || r1 > 10000 || r2 < 0 || r2 > 10000)
{
printf("\nPlease check number range!!\n");
scanf("%d %d %d %d %d %d", &x1, &x2, &r1, &y1, &y2, &r2);
}
else
break;
}

distance = squa(x2 - x1) + squa(y2 - y1);

printf("distance %d\n", distance);

if(distance == 0)
{
if(r1 == r2)
num[j] = -1;
else
num[j] = 0;
}
else if(distance == squa(r1 + r2))
num[j] = 1;
else if(distance == squa(r1 - r2))
num[j] = 1;
else if(distance > squa(r1 + r2))
num[j] = 0;
else if(distance < squa(r1 - r2))
num[j] = 0;
else
num[j] = 2;
}

for(j=0; j<i; j++)
printf("%d\n", num[j]);

return 0;
}

어느 부분을 빠트린걸까요 ㅠㅠ