why result from calculator as not equal as from program?

APW16

Hi, I confuse about the result from calculator not equal from promgram. How about round float number in processing.

Calculate with MS excel

Calculate with Procesing

Below is my code.

float A,B,C;

void setup(){
  size(300,300);
  A=-7;
  B=6;
  C=-5;
  float r = sqrt(sq(A)+sq(B)+sq(C));
  float t = degrees(atan(sqrt((sq(A)+sq(B)))/C));
  float p = degrees(atan(B/A));
  println(r,t,p);

}

GoToLoop

Use datatype double + class Math:

1. https://Processing.org/reference/double.html
2. http://docs.Oracle.com/javase/8/docs/api/java/lang/Math.html

---

final int A = -7, B = 6, C = -5;

float r = sqrt( A*A + B*B + C*C );
float t = degrees(atan( sqrt(A*A + B*B) / C ));
float p = degrees(atan( (float) B/A ));

println(r, t, p); // 10.488089 -61.527863 -40.60129
exit();

---

final int A = -7, B = 6, C = -5;

double r = Math.sqrt( A*A + B*B + C*C );
double t = Math.toDegrees(Math.atan( Math.sqrt(A*A + B*B) / C ));
double p = Math.toDegrees(Math.atan( (double) B/A ));

println(r, t, p); // 10.488088481701515 -61.527865575427 -40.60129464500447
exit();

---

blindfish

This has been answered before ;)