角度与弧度的转换

转换关系

radians = degrees x Π / 180
degrees = radians x 180 / Π

#ifndef TRIG_H
#define TRIG_H
#include <iostream.h>
#include <math.h>
double radians (double d);
double degrees (double r);
#endif

#include "trig.h"
double radians (double d) {
return d * M_PI / 180;
}
double degrees (double r) {
return r * 180/ M_PI;
}