diff --git a/src/print/printer.c b/src/print/printer.c
index 0b74ff6..4d5a632 100644
--- a/src/print/printer.c
+++ b/src/print/printer.c
@@ -2,65 +2,73 @@
 
 #include <stdio.h>
 
-static void printer_binop(const struct binop_node *bin_op)
+static void printer_ast(const struct ast_node *ast, FILE *file);
+
+static void printer_binop(const struct binop_node *bin_op, FILE *file)
 {
-    putchar('(');
-    printer_ast(bin_op->lhs);
+    fputc('(', file);
+    printer_ast(bin_op->lhs, file);
     switch (bin_op->op)
     {
     case PLUS:
-        printf(" + ");
+        fputs(" + ", file);
         break;
     case MINUS:
-        printf(" - ");
+        fputs(" - ", file);
         break;
     case TIMES:
-        printf(" * ");
+        fputs(" * ", file);
         break;
     case DIVIDE:
-        printf(" / ");
+        fputs(" / ", file);
         break;
     default:
         break;
     }
-    printer_ast(bin_op->rhs);
-    putchar(')');
+    printer_ast(bin_op->rhs, file);
+    fputc(')', file);
 }
 
-static void printer_unop(const struct unop_node *un_op)
+static void printer_unop(const struct unop_node *un_op, FILE *file)
 {
-    putchar('(');
+    fputc('(', file);
     switch (un_op->op)
     {
     case NEGATE:
-        printf("- ");
+        fputs("- ", file);
     case IDENTITY:
     default:
         break;
     }
-    printer_ast(un_op->rhs);
-    putchar(')');
+    printer_ast(un_op->rhs, file);
+    fputc(')', file);
 }
 
-static void printer_num(int num)
+static void printer_num(int num, FILE *file)
 {
-    printf("%d", num);
+    fprintf(file, "%d", num);
 }
 
-void printer_ast(const struct ast_node *ast)
+static void printer_ast(const struct ast_node *ast, FILE *file)
 {
     switch (ast->kind)
     {
     case BINOP:
-        printer_binop(&ast->val.bin_op);
+        printer_binop(&ast->val.bin_op, file);
         break;
     case UNOP:
-        printer_unop(&ast->val.un_op);
+        printer_unop(&ast->val.un_op, file);
         break;
     case NUM:
-        printer_num(ast->val.num);
+        printer_num(ast->val.num, file);
         break;
     default:
         break;
     }
 }
+
+void print_ast(const struct ast_node *ast, FILE *file)
+{
+    printer_ast(ast, file);
+    fputc('\n', file);
+}
diff --git a/src/print/printer.h b/src/print/printer.h
index 6f087b5..ca9e551 100644
--- a/src/print/printer.h
+++ b/src/print/printer.h
@@ -1,8 +1,10 @@
 #ifndef PRINTER_H
 #define PRINTER_H
 
+#include <stdio.h>
+
 #include "ast/ast.h"
 
-void printer_ast(const struct ast_node *ast);
+void print_ast(const struct ast_node *ast, FILE *file);
 
 #endif /* !PRINTER_H */