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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
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+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+// Some simple testing of new, eval and some string stuff.
+
+// constructor -- expression array initialization
+function ExprArray(n,v)
+{
+ // Initializes n values to v coerced to a string.
+ for (var i = 0; i < n; i++) {
+ this[i] = "" + v;
+ }
+}
+
+
+// Print the perfect numbers up to n and the sum expression for n's divisors.
+function perfect(n)
+{
+ print("The perfect numbers up to " + n + " are:");
+ var results = [];
+
+ // We build sumOfDivisors[i] to hold a string expression for
+ // the sum of the divisors of i, excluding i itself.
+ var sumOfDivisors = new ExprArray(n+1,1);
+ for (var divisor = 2; divisor <= n; divisor++) {
+ for (var j = divisor + divisor; j <= n; j += divisor) {
+ sumOfDivisors[j] += " + " + divisor;
+ }
+ // At this point everything up to 'divisor' has its sumOfDivisors
+ // expression calculated, so we can determine whether it's perfect
+ // already by evaluating.
+ if (eval(sumOfDivisors[divisor]) == divisor) {
+ print("" + divisor + " = " + sumOfDivisors[divisor]);
+ results.push(divisor);
+ }
+ }
+ print("That's all.");
+ return results;
+}
+
+
+print("\nA number is 'perfect' if it is equal to the sum of its")
+print("divisors (excluding itself).\n");
+
+reportCompare(perfect(500).join(), "6,28,496");