Magic constant: Difference between revisions
Add C# implementation
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=={{header|C#}}==
{{trans|Java}}
<syntaxhighlight lang="C#">
using System;
public class MagicConstant {
private const int OrderFirstMagicSquare = 3;
public static void Main(string[] args) {
Console.WriteLine("The first 20 magic constants:");
for (int i = 1; i <= 20; i++) {
Console.Write(" " + MagicConstantValue(Order(i)));
}
Console.WriteLine("\n");
Console.WriteLine("The 1,000th magic constant: " + MagicConstantValue(Order(1_000)) + "\n");
Console.WriteLine("Order of the smallest magic square whose constant is greater than:");
for (int i = 1; i <= 20; i++) {
string powerOf10 = "10^" + i + ":";
Console.WriteLine($"{powerOf10,6}{MinimumOrder(i),8}");
}
}
// Return the magic constant for a magic square of the given order
private static int MagicConstantValue(int n) {
return n * (n * n + 1) / 2;
}
// Return the smallest order of a magic square such that its magic constant is greater than 10 to the given power
private static int MinimumOrder(int n) {
return (int)Math.Exp((Math.Log(2.0)+ n * Math.Log(10.0)) / 3) + 1;
}
// Return the order of the magic square at the given index
private static int Order(int index) {
return OrderFirstMagicSquare + index - 1;
}
}
</syntaxhighlight>
{{out}}
<pre>
The first 20 magic constants:
15 34 65 111 175 260 369 505 671 870 1105 1379 1695 2056 2465 2925 3439 4010 4641 5335
The 1,000th magic constant: 503006505
Order of the smallest magic square whose constant is greater than:
10^1: 3
10^2: 6
10^3: 13
10^4: 28
10^5: 59
10^6: 126
10^7: 272
10^8: 585
10^9: 1260
10^10: 2715
10^11: 5849
10^12: 12600
10^13: 27145
10^14: 58481
10^15: 125993
10^16: 271442
10^17: 584804
10^18: 1259922
10^19: 2714418
10^20: 5848036
</pre>
=={{header|C++}}==
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