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June 2018 Update

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Ingy döt Net 2018-06-22 20:57:24 +00:00
parent ba8067c3b7
commit 22f33d4004
5278 changed files with 84726 additions and 14379 deletions
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48
Task/Averages-Mean-time-of-day/Java/averages-mean-time-of-day.java Normal file
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public class MeanTimeOfDay {
static double meanAngle(double[] angles) {
int len = angles.length;
double sinSum = 0.0;
for (int i = 0; i < len; i++) {
sinSum += Math.sin(angles[i] * Math.PI / 180.0);
}
double cosSum = 0.0;
for (int i = 0; i < len; i++) {
cosSum += Math.cos(angles[i] * Math.PI / 180.0);
}
return Math.atan2(sinSum / len, cosSum / len) * 180.0 / Math.PI;
}
/* time string assumed to be in format "hh:mm:ss" */
static int timeToSecs(String t) {
int hours = Integer.parseInt(t.substring(0, 2));
int mins = Integer.parseInt(t.substring(3, 5));
int secs = Integer.parseInt(t.substring(6, 8));
return 3600 * hours + 60 * mins + secs;
}
/* 1 second of time = 360/(24 * 3600) = 1/240th degree */
static double timeToDegrees(String t) {
return timeToSecs(t) / 240.0;
}
static String degreesToTime(double d) {
if (d < 0.0) d += 360.0;
int secs = (int)(d * 240.0);
int hours = secs / 3600;
int mins = secs % 3600;
secs = mins % 60;
mins /= 60;
return String.format("%2d:%2d:%2d", hours, mins, secs);
}
public static void main(String[] args) {
String[] tm = {"23:00:17", "23:40:20", "00:12:45", "00:17:19"};
double[] angles = new double[4];
for (int i = 0; i < 4; i++) angles[i] = timeToDegrees(tm[i]);
double mean = meanAngle(angles);
System.out.println("Average time is : " + degreesToTime(mean));
}
}