Data commit

Task/Magic-constant/Go/magic-constant.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+    "fmt"
+    "math"
+    "rcu"
+)
+
+func magicConstant(n int) int {
+    return (n*n + 1) * n / 2
+}
+
+var ss = []string{
+    "\u2070", "\u00b9", "\u00b2", "\u00b3", "\u2074",
+    "\u2075", "\u2076", "\u2077", "\u2078", "\u2079",
+}
+
+func superscript(n int) string {
+    if n < 10 {
+        return ss[n]
+    }
+    if n < 20 {
+        return ss[1] + ss[n-10]
+    }
+    return ss[2] + ss[0]
+}
+
+func main() {
+    fmt.Println("First 20 magic constants:")
+    for n := 3; n <= 22; n++ {
+        fmt.Printf("%5d ", magicConstant(n))
+        if (n-2)%10 == 0 {
+            fmt.Println()
+        }
+    }
+
+    fmt.Println("\n1,000th magic constant:", rcu.Commatize(magicConstant(1002)))
+
+    fmt.Println("\nSmallest order magic square with a constant greater than:")
+    for i := 1; i <= 20; i++ {
+        goal := math.Pow(10, float64(i))
+        order := int(math.Cbrt(goal*2)) + 1
+        fmt.Printf("10%-2s : %9s\n", superscript(i), rcu.Commatize(order))
+    }
+}