From babceab9f3f5bdc5365a06e9effdb4acc4e24a02 Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Sun, 7 Mar 2021 18:46:23 +0100
Subject: solved problem 4

---
 src/main.zig | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

(limited to 'src/main.zig')

diff --git a/src/main.zig b/src/main.zig
index 3096ab3..f6e3ec2 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,7 +1,5 @@
 const std = @import("std");
 const print = std.debug.warn;
-// spalf
-// mypassword
 
 fn p1() void {
     var i: usize = 0;
@@ -76,26 +74,30 @@ fn p3() void {
     }
 }
 
-fn p4() void {
+fn p4() !void {
     var i: usize = 0;
     var j: usize = 0;
-    var str: [10]u8 = undefined;
-    while (i < 100) : (i += 1) {
+    var str: [6]u8 = undefined;
+    var largest: usize = 0;
+    while (i < 1000) : (i += 1) {
         j = 0;
-        while (j < 100) : (j += 1) {
-            //std.fmt.bufPrint(&str, "{}", .{i * j}) catch unreachable;
-            //if (std.fmt.bufPrint(&str, "{}", .{i*j})) |ret| {
-            //   std.debug.warn("{}\n", .{str});
-            //} else | err | {
-            //}
-            //var str: parseInt(usize, i*j)
+        while (j < 1000) : (j += 1) {
+            _ = try std.fmt.bufPrint(&str, "{}", .{i * j});
+            if (i * j > largest and
+                str[0] == str[5] and
+                str[1] == str[4] and
+                str[2] == str[3])
+            {
+                largest = i * j;
+            }
         }
     }
+    print("{}\n", .{largest});
 }
 
-pub fn main() void {
+pub fn main() !void {
     //p1();
     //p2();
     //p3();
-    p4();
+    _ = try p4();
 }
-- 
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