Data commit

Task/Happy-numbers/Zig/happy-numbers.zig

@@ -0,0 +1,36 @@
+const std = @import("std");
+const stdout = std.io.getStdOut().outStream();
+
+pub fn main() !void {
+    try stdout.print("The first 8 happy numbers are: ", .{});
+    var n: u32 = 1;
+    var c: u4 = 0;
+    while (c < 8) {
+        if (isHappy(n)) {
+            c += 1;
+            try stdout.print("{} ", .{n});
+        }
+        n += 1;
+    }
+    try stdout.print("\n", .{});
+}
+
+fn isHappy(n: u32) bool {
+    var t = n;
+    var h = sumsq(n);
+    while (t != h) {
+        t = sumsq(t);
+        h = sumsq(sumsq(h));
+    }
+    return t == 1;
+}
+
+fn sumsq(n0: u32) u32 {
+    var s: u32 = 0;
+    var n = n0;
+    while (n > 0) : (n /= 10) {
+        const m = n % 10;
+        s += m * m;
+    }
+    return s;
+}