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Averages/Mean time of day: Difference between revisions
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<pre>23:47:43</pre>
=={{header|Oberon-2}}==
{{works with|oo2c}}
<lang oberon2>
MODULE AvgTimeOfDay;
IMPORT
M := LRealMath,
T := NPCT:Tools,
Out := NPCT:Console;
CONST
secsDay = 86400;
secsHour = 3600;
secsMin = 60;
toRads = M.pi / 180;
VAR
h,m,s: LONGINT;
data: ARRAY 4 OF LONGREAL;
PROCEDURE TimeToDeg(time: STRING): LONGREAL;
VAR
parts: ARRAY 3 OF STRING;
h,m,s: LONGREAL;
BEGIN
T.Split(time,':',parts);
h := T.StrToInt(parts[0]);
m := T.StrToInt(parts[1]);
s := T.StrToInt(parts[2]);
RETURN (h * secsHour + m * secsMin + s) * 360 / secsDay;
END TimeToDeg;
PROCEDURE DegToTime(d: LONGREAL; VAR h,m,s: LONGINT);
VAR
ds: LONGREAL;
PROCEDURE Mod(x,y: LONGREAL): LONGREAL;
VAR
c: LONGREAL;
BEGIN
c := ENTIER(x / y);
RETURN x - c * y
END Mod;
BEGIN
ds := Mod(d,360.0) * secsDay / 360.0;
h := ENTIER(ds / secsHour);
m := ENTIER(Mod(ds,secsHour) / secsMin);
s := ENTIER(Mod(ds,secsMin));
END DegToTime;
PROCEDURE Mean(g: ARRAY OF LONGREAL): LONGREAL;
VAR
i,l: LONGINT;
sumSin, sumCos: LONGREAL;
BEGIN
i := 0;l := LEN(g);sumSin := 0.0;sumCos := 0.0;
WHILE i < l DO
sumSin := sumSin + M.sin(g[i] * toRads);
sumCos := sumCos + M.cos(g[i] * toRads);
INC(i)
END;
RETURN M.arctan2(sumSin / l,sumCos / l) * 180 / M.pi;
END Mean;
BEGIN
data[0] := TimeToDeg("23:00:17");
data[1] := TimeToDeg("23:40:20");
data[2] := TimeToDeg("00:12:45");
data[3] := TimeToDeg("00:17:19");
DegToTime(Mean(data),h,m,s);
Out.String(":> ");Out.Int(h,0);Out.Char(':');Out.Int(m,0);Out.Char(':');Out.Int(s,0);Out.Ln
END AvgTimeOfDay.
</lang>
{{Out}}
<pre>
:> 23:47:43
</pre>
=={{header|OCaml}}==
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