diff --git a/src/ast.zig b/src/ast.zig
index 1ed62f4..acc8211 100644
--- a/src/ast.zig
+++ b/src/ast.zig
@@ -1,19 +1,80 @@
 pub const AstNodeType = enum {
     Program,
+    BinOp,
+    Number,
 };
 
 pub const AstNode = union(AstNodeType) {
     Program: []AstNode,
+    BinOp: AstBinOp,
+    Number: AstNumber,
+};
+
+pub const BinOpType = enum {
+    Equality,
+};
+
+pub const AstBinOp = struct {
+    optype: BinOpType,
+
+    // TODO expression
+    left: AstNumber,
+    right: AstNumber,
+};
+
+pub const NumberType = enum {
+    Integer32,
+    Integer64,
+    Unsigned32,
+    Unsigned64,
+    Float32,
+    Float64,
+};
+
+pub const AstNumber = union(NumberType) {
+    Integer32: i32,
+    Integer64: i64,
+    Unsigned32: u32,
+    Unsigned64: u64,
+    Float32: f32,
+    Float64: f64,
 };
 
 pub fn printNode(stdout: var, node: AstNode) anyerror!void {
     switch (node) {
         .Program => |children| try printNodes(stdout, children),
+        .BinOp => |bin_op| blk: {
+            try stdout.print("(");
+            switch (bin_op.optype) {
+                .Equality => try stdout.write("=="),
+            }
+
+            try stdout.write(" ");
+            try printNode(stdout, AstNode{ .Number = bin_op.left });
+            try stdout.write(" ");
+            try printNode(stdout, AstNode{ .Number = bin_op.right });
+            try stdout.print(")");
+        },
+        .Number => |ast_num| {
+            switch (ast_num) {
+                .Integer32 => |num| try stdout.print("{}", num),
+                .Integer64 => |num| try stdout.print("{}", num),
+                .Unsigned32 => |num| try stdout.print("{}", num),
+                .Unsigned64 => |num| try stdout.print("{}", num),
+                .Float32 => |num| try stdout.print("{}", num),
+                .Float64 => |num| try stdout.print("{}", num),
+            }
+        },
     }
 }
 
 fn printNodes(stdout: var, nodes: []AstNode) anyerror!void {
+    try stdout.print("(");
+
     for (nodes) |node| {
+        try stdout.print(" ");
         try printNode(stdout, node);
     }
+
+    try stdout.print(")");
 }
diff --git a/src/parser.zig b/src/parser.zig
index e57d0ec..5144bb5 100644
--- a/src/parser.zig
+++ b/src/parser.zig
@@ -51,12 +51,13 @@ pub const Parser = struct {
         }
     }
 
+    fn statement(self: *Parser) !void {}
+
+    fn block(self: *Parser) !void {}
+
     fn program(self: *Parser) !void {
         try self.advance();
-        try self.advance();
-        try self.advance();
-        try self.advance();
-
+        try self.block();
         try self.expect(.EOF);
     }
 
diff --git a/src/runner.zig b/src/runner.zig
index 61c0af1..fd624b3 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -40,9 +40,18 @@ pub const Runner = struct {
         try self.testScanner(&scanner);
 
         scanner = scanners.Scanner.init(self.allocator, code);
-        var parser = Parser.init(self.allocator, &scanner);
-        var tree = try parser.parse();
-        try ast.printNode(self.stdout, tree);
+        //var parser = Parser.init(self.allocator, &scanner);
+        //var tree = try parser.parse();
+        try ast.printNode(self.stdout, ast.AstNode{
+            .Program = &[]ast.AstNode{ast.AstNode{
+                .BinOp = ast.AstBinOp{
+                    .optype = ast.BinOpType.Equality,
+                    .left = ast.AstNumber{ .Integer32 = 30 },
+                    .right = ast.AstNumber{ .Integer32 = 30 },
+                },
+            }},
+        });
+        try self.stdout.print("\n");
         return Result.Ok;
     }
 };