# include 
# include 

Struct point_t {
Double x, y; 
}; 

Struct circle_t {
Struct point_t center; 
Double r; 
}; 

Int double_equals (double const a, double const b) 
{
The static const double ZERO e=1-15; 
Return fabs (a - b) & lt; ZERO; 
} 

A, double distance_sqr (struct point_t const * struct point_t const * b) 
{
Return (a - & gt; X - b - & gt; X) * (a - & gt; X - b - & gt; X) + (a - & gt; Y - b - & gt; Y) * (a - & gt; Y - b - & gt; Y); 
} 

A, double short (struct point_t const * struct point_t const * b) 
{
Return SQRT (distance_sqr (a, b)); 
} 

Int insect (struct circle_t circles [], struct point_t points []) 
{
Double d, a, b, c, p, q, r. 
Double cos_value [2], sin_value [2]; 
If (double_equals (circles [0]. Center. X, circles. [1] center. X) 
& & Double_equals (circles [0]. Center. Y, circles. [1] center. Y) 
& & Double_equals (circles [0]. J r, circles. [1] r)) {
return -1; 
} 

D=short (& amp; Circles [0]. Center, & amp; Circles [1]. The center); 
If (d & gt; Circles [0]. R + circles. [1] r 
| | d & lt; Fabs (circles [0]. R - circles. [1] r)) {
return 0; 
} 

A=2.0 * circles [0]. R * (circles. [0] center. The X-ray circles. [1] center. X); 
B=2.0 * circles [0]. R * (circles. [0] center. The y - circles. [1] center. Y); 
C=circles. [1] r * circles. [1] r - circles. [0] r * circles. [0] r 
- distance_sqr (& amp; Circles [0]. Center, & amp; Circles [1]. The center); 
P=a * a + b * b; 
Q=2.0 * a * c; 
If (double_equals (d, circles [0]. R + circles. [1] r) 
| | double_equals (d, fabs (circles. [0] r - circles. [1] r))) {
Cos_value [0]=- q/p/2.0; 
Sin_value [0]=SQRT (1 - cos_value cos_value [0] * [0]). 

Points [0]. X=circles. [0] r * cos_value [0] + circles. [0] center. X. 
Points [0]. Y=circles. [0] r * sin_value [0] + circles. [0] center. Y; 

if (! Double_equals (distance_sqr (& amp; Points [0], & amp; Circles [1]. The center), 
Circles. [1] r * circles. [1] r)) {
Points [0]. Y=circles. [0] center. The y - circles. [0] r * sin_value [0]. 
} 
return 1; 
} 

R=c - c * b * b; 
Cos_value [0]=(SQRT (q * q - 4.0 * p * r) - q)/p/2.0; 
Cos_value [1]=(- SQRT (q * q - 4.0 * p * r) - q)/p/2.0; 
Sin_value [0]=SQRT (1 - cos_value cos_value [0] * [0]). 
Sin_value [1]=SQRT (1 - cos_value cos_value [1] * [1]). 

Points [0]. X=circles. [0] r * cos_value [0] + circles. [0] center. X. 
Points [1]. X=circles. [0] r * cos_value [1] + circles. [0] center. X. 
Points [0]. Y=circles. [0] r * sin_value [0] + circles. [0] center. Y; 
Points. [1] y=circles. [0] r * sin_value [1] + circles. [0] center. Y; 

if (! Double_equals (distance_sqr (& amp; Points [0], & amp; Circles [1]. The center), 
Circles. [1] r * circles. [1] r)) {
Points [0]. Y=circles. [0] center. The y - circles. [0] r * sin_value [0]. 
} 
if (! Double_equals (distance_sqr (& amp; Points [1], & amp; Circles [1]. The center), 
Circles. [1] r * circles. [1] r)) {
Points. [1] y=circles. [0] center. The y - circles. [0] r * sin_value [1]. 
} 
If (double_equals (points [0]. J y, points [1]. The y) 
& & Double_equals (points [0]. J x, points [1]. X)) {
If (points [0]. Y & gt; 0 {
Points. [1] y=- points [1]. The y; 
} else {
Points [0]. Y=- points [0]. Y; 
} 
} 
return 2; 
} 

Int main () 
{
Struct circle_t circles [2]. 
Struct point_t points [2]. 
Printf (" please enter the two round x, y, radius (separated by commas) : "); 

Circles [0]. Center. X=0; 
Circles [0]. Center. Y=0; 
Circles [0]. R=5; 
Circles [1]. Center. X=6; Circles [1]. Center. Y=0; Circles [1]. The r=1; 

The switch (insect (circles, points)) 
{
Case 1: 
Printf (" THE CIRCLES ARE THE SAME/n "); 
break; 
Case 0: 
Printf (" NO INTERSECTION computes/n "); 
break; 
Case 1: 
Printf (" % f, % f) \ n ", points [0]. J x, points [0]. Y); 
break; 
Case 2: 
Printf (" % f % f) (f % % f) \ n ", 
Points [0]. J x, points [0]. J y, 
Points [1]. J x, points [1]. The y); 
} 

return 0; 
} 

CodePudding user response:

Pointer to visit
- patches,,,,,,,

CodePudding user response:

Results no root?

CodePudding user response:

Well, it seems that is three circular intersection formula,
This is wireless positioning?

CodePudding user response:

Is a mathematical formula,

CodePudding user response:

Just a pointer

CodePudding user response:

A - & gt; B
Equivalent to
(* a). B

CodePudding user response:

Type a, b, the square of the distance