どうすれば以下の精度(精度)を向上させることができますか?
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;
}
編集:ここに構造体があることを追加するのを忘れました:
struct Degree_Minutes { signed int degrees; signed int minutes; double seconds; };
10進数から度/分/秒に変換してから10進数に戻すまでに、元の値が38.898556の場合は38.9134になります。