如何提高以下准确性(精度)?
struct Degree_Minutes { signed int degrees; signed int minutes; double seconds; };
Degree_Minutes geo_dec_to_deg (double dec)
{
Degree_Minutes degrees_minutes;
signed int degrees, minutes;
double remainder, temp, seconds;
remainder = fmod(dec, 1);
degrees_minutes.degrees = dec - remainder;
temp = remainder*60;
remainder = fmod(temp,1);
degrees_minutes.minutes = temp-remainder;
degrees_minutes.seconds = remainder*60;
return degrees_minutes;
}
double geo_deg_to_dec (Degree_Minutes degrees)
{
double decimal = degrees.degrees + (degrees.minutes/60) + (degrees.seconds/60);
return decimal;
}
int main(int argc, char **argv)
{
Degree_Minutes deg;
double decimal = 38.898556;
deg = geo_dec_to_deg(decimal);
cout << "Results of geo_dec_to_deg function: \n" << decimal << " was converted to " << deg.degrees << " degrees, " << deg.minutes << " minutes, " << deg.seconds << " seconds.\n";
decimal = geo_deg_to_dec(deg);
cout << "Results of geo_dec_to_deg function: \n" << deg.degrees << " degrees, " << deg.minutes << " minutes, " << deg.seconds << " seconds was converted to " << decimal << "\n";
return EXIT_SUCCESS;
}
编辑:忘记添加这里有一个结构:
struct Degree_Minutes { signed int degrees; signed int minutes; double seconds; };
当您从十进制转换为度/分/秒,然后再转换回十进制时,您会得到 38.9134,而原始值为 38.898556。