diff --git a/nac3standalone/demo/demo.c b/nac3standalone/demo/demo.c
index ccc15cc..aea249d 100644
--- a/nac3standalone/demo/demo.c
+++ b/nac3standalone/demo/demo.c
@@ -20,20 +20,41 @@
   #define usize uint16_t
 #endif
 
-void output_int32(const int32_t x) {
-  printf("%d\n", x);
+struct cslice {
+  const void *data;
+  usize len;
+};
+
+void output_int32(const int32_t x, bool newline) {
+  printf("%d", x);
+
+  if (newline) {
+    fputc('\n', stdout);
+  }
 }
 
 void output_int64(const int64_t x) {
-  printf("%ld\n", x);
+  printf("%ld", x);
+
+  if (newline) {
+    fputc('\n', stdout);
+  }
 }
 
 void output_uint32(const uint32_t x) {
-  printf("%d\n", x);
+  printf("%d", x);
+
+  if (newline) {
+    fputc('\n', stdout);
+  }
 }
 
 void output_uint64(const uint64_t x) {
-  printf("%ld\n", x);
+  printf("%ld", x);
+
+  if (newline) {
+    fputc('\n', stdout);
+  }
 }
 
 void output_asciiart(const int32_t x) {
@@ -43,20 +64,29 @@ void output_asciiart(const int32_t x) {
   } else {
     fputc(chars[x], stdout);
   }
+
+  if (newline) {
+    fputc('\n', stdout);
+  }
 }
 
-struct cslice_int32 {
-  const int32_t* data;
-  usize len;
-};
+void output_str(struct cslice *slice, bool newline) {
+  for (usize i = 0; i < slice->len; ++i) {
+    fputc(((const char *) slice->data)[i], stdout);
+  }
 
-void output_int32_list(struct cslice_int32* slice) {
+  if (newline) {
+    fputc('\n', stdout);
+  }
+}
+
+void output_int32_list(struct cslice *slice) {
   fputc('[', stdout);
   for (usize i = 0; i < slice->len; ++i) {
     if (i == slice->len - 1) {
-      printf("%d", slice->data[i]);
+      printf("%d", ((const int32_t *) slice->data)[i]);
     } else {
-      printf("%d, ", slice->data[i]);
+      printf("%d, ", ((const int32_t *) slice->data)[i]);
     }
   }
   puts("]");
diff --git a/nac3standalone/demo/demo.rs b/nac3standalone/demo/demo.rs
index c7e4452..9b14a29 100644
--- a/nac3standalone/demo/demo.rs
+++ b/nac3standalone/demo/demo.rs
@@ -1,3 +1,7 @@
+use std::io;
+use std::io::Write;
+use std::process::exit;
+
 mod cslice {
     // copied from https://github.com/dherman/cslice
     use std::marker::PhantomData;
@@ -19,30 +23,60 @@ mod cslice {
 }
 
 #[no_mangle]
-pub extern "C" fn output_int32(x: i32) {
-    println!("{}", x);
+pub extern "C" fn output_int32(x: i32, newline: bool) {
+    let str = format!("{x}");
+
+    if newline {
+        println!("{str}");
+    } else {
+        print!("{str}");
+    }
 }
 
 #[no_mangle]
-pub extern "C" fn output_int64(x: i64) {
-    println!("{}", x);
+pub extern "C" fn output_int64(x: i64, newline: bool) {
+    let str = format!("{x}");
+
+    if newline {
+        println!("{str}");
+    } else {
+        print!("{str}");
+    }
 }
 
 #[no_mangle]
-pub extern "C" fn output_uint32(x: u32) {
-    println!("{}", x);
+pub extern "C" fn output_uint32(x: u32, newline: bool) {
+    let str = format!("{x}");
+
+    if newline {
+        println!("{str}");
+    } else {
+        print!("{str}");
+    }
 }
 
 #[no_mangle]
-pub extern "C" fn output_uint64(x: u64) {
-    println!("{}", x);
+pub extern "C" fn output_uint64(x: u64, newline: bool) {
+    let str = format!("{x}");
+
+    if newline {
+        println!("{str}");
+    } else {
+        print!("{str}");
+    }
 }
 
 #[no_mangle]
-pub extern "C" fn output_float64(x: f64) {
+pub extern "C" fn output_float64(x: f64, newline: bool) {
     // debug output to preserve the digits after the decimal points
     // to match python `print` function
-    println!("{:?}", x);
+    let str = format!("{:?}", x);
+
+    if newline {
+        println!("{str}");
+    } else {
+        print!("{str}");
+    }
 }
 
 #[no_mangle]
@@ -56,7 +90,18 @@ pub extern "C" fn output_asciiart(x: i32) {
 }
 
 #[no_mangle]
-pub extern "C" fn output_int32_list(x: &cslice::CSlice<i32>) {
+pub extern "C" fn output_str(x: &cslice::CSlice<u8>, newline: bool) {
+    for e in x.as_ref().iter() {
+        print!("{}", char::from(*e));
+    }
+
+    if newline {
+        println!("");
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn output_int32_list(x: &cslice::CSlice<i32>, newline: bool) {
     print!("[");
     let mut it = x.as_ref().iter().peekable();
     while let Some(e) = it.next() {
@@ -66,7 +111,11 @@ pub extern "C" fn output_int32_list(x: &cslice::CSlice<i32>) {
             print!("{}, ", e);
         }
     }
-    println!("]");
+    print!("]");
+
+    if newline {
+        println!("");
+    }
 }
 
 #[no_mangle]
@@ -75,10 +124,19 @@ pub extern "C" fn __nac3_personality(_state: u32, _exception_object: u32, _conte
 }
 
 #[no_mangle]
-pub extern "C" fn __nac3_raise(_state: u32, _exception_object: u32, _context: u32) -> u32 {
-    unimplemented!();
+pub extern "C" fn __nac3_raise(state: u32, exception_object: u32, context: u32) -> u32 {
+    writeln!(io::stderr(),
+         "__nac3_raise(state: {:#010x}, _exception_object: {:#010x}, _context: {:#010x})",
+        state,
+        exception_object,
+        context
+    ).unwrap();
+    exit(101);
 }
 
+#[no_mangle]
+pub extern "C" fn __nac3_end_catch() {}
+
 extern "C" {
     fn run() -> i32;
 }
diff --git a/nac3standalone/demo/interpret_demo.py b/nac3standalone/demo/interpret_demo.py
index 71bb426..3661888 100755
--- a/nac3standalone/demo/interpret_demo.py
+++ b/nac3standalone/demo/interpret_demo.py
@@ -48,6 +48,12 @@ def patch(module):
         else:
             sys.stdout.write(" .,-:;i+hHM$*#@  "[x])
 
+    def output(x, newline: bool=True):
+        if newline:
+            print(x)
+        else:
+            print(x, end="")
+
     def extern(fun):
         name = fun.__name__
         if name == "output_asciiart":
@@ -58,9 +64,10 @@ def patch(module):
             "output_int32_list",
             "output_uint32",
             "output_uint64",
-            "output_float64"
+            "output_float64",
+            "output_str",
         }:
-            return print
+            return output
         else:
             raise NotImplementedError
 
diff --git a/nac3standalone/demo/src/classes.py b/nac3standalone/demo/src/classes.py
index fd9b361..2f54ce5 100644
--- a/nac3standalone/demo/src/classes.py
+++ b/nac3standalone/demo/src/classes.py
@@ -1,9 +1,9 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 @extern
-def output_int64(x: int64):
+def output_int64(x: int64, newline: bool=True):
     ...
 
 
diff --git a/nac3standalone/demo/src/default_param.py b/nac3standalone/demo/src/default_param.py
index a55df21..4e292e2 100644
--- a/nac3standalone/demo/src/default_param.py
+++ b/nac3standalone/demo/src/default_param.py
@@ -1,5 +1,5 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 def f1(a: int32 = 4):
diff --git a/nac3standalone/demo/src/demo_test.py b/nac3standalone/demo/src/demo_test.py
new file mode 100644
index 0000000..02f41fd
--- /dev/null
+++ b/nac3standalone/demo/src/demo_test.py
@@ -0,0 +1,61 @@
+@extern
+def output_int32(x: int32, newline: bool=True):
+	...
+
+@extern
+def output_int64(x: int64, newline: bool=True):
+	...
+
+@extern
+def output_uint32(x: uint32, newline: bool=True):
+	...
+
+@extern
+def output_uint64(x: uint64, newline: bool=True):
+	...
+
+@extern
+def output_int32_list(x: list[int32], newline: bool=True):
+	...
+
+@extern
+def output_asciiart(x: int32):
+	...
+
+@extern
+def output_str(x: str, newline: bool=True):
+	...
+
+def test_output_int32():
+	output_int32(-128)
+
+def test_output_int64():
+	output_int64(int64(-256))
+
+def test_output_uint32():
+	output_uint32(uint32(128))
+
+def test_output_uint64():
+	output_uint64(uint64(256))
+
+def test_output_asciiart():
+	for i in range(17):
+		output_asciiart(i)
+	output_asciiart(0)
+
+def test_output_int32_list():
+	output_int32_list([0, 1, 3, 5, 10])
+
+def test_output_str_family():
+	output_str("hello ", newline=False)
+	output_str("world")
+
+def run() -> int32:
+	test_output_int32()
+	test_output_int64()
+	test_output_uint32()
+	test_output_uint64()
+	test_output_asciiart()
+	test_output_int32_list()
+	test_output_str_family()
+	return 0
\ No newline at end of file
diff --git a/nac3standalone/demo/src/inheritance.py b/nac3standalone/demo/src/inheritance.py
index d280e3a..be37183 100644
--- a/nac3standalone/demo/src/inheritance.py
+++ b/nac3standalone/demo/src/inheritance.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 class A:
diff --git a/nac3standalone/demo/src/len.py b/nac3standalone/demo/src/len.py
index 5072420..c9b0a61 100644
--- a/nac3standalone/demo/src/len.py
+++ b/nac3standalone/demo/src/len.py
@@ -1,5 +1,5 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 
diff --git a/nac3standalone/demo/src/lists.py b/nac3standalone/demo/src/lists.py
index f05701b..e752fb7 100644
--- a/nac3standalone/demo/src/lists.py
+++ b/nac3standalone/demo/src/lists.py
@@ -1,9 +1,9 @@
 @extern
-def output_int32_list(x: list[int32]):
+def output_int32_list(x: list[int32], newline: bool=True):
     ...
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 class A:
diff --git a/nac3standalone/demo/src/loop.py b/nac3standalone/demo/src/loop.py
index 8f383fe..940679f 100644
--- a/nac3standalone/demo/src/loop.py
+++ b/nac3standalone/demo/src/loop.py
@@ -1,7 +1,7 @@
 # For Loop using an increasing range() expression as its iterable
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 def run() -> int32:
diff --git a/nac3standalone/demo/src/loop_decr.py b/nac3standalone/demo/src/loop_decr.py
index 59afb1b..f180e6e 100644
--- a/nac3standalone/demo/src/loop_decr.py
+++ b/nac3standalone/demo/src/loop_decr.py
@@ -1,7 +1,7 @@
 # For Loop using a decreasing range() expression as its iterable
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 def run() -> int32:
diff --git a/nac3standalone/demo/src/loop_iterable.py b/nac3standalone/demo/src/loop_iterable.py
index d97ab30..0218990 100644
--- a/nac3standalone/demo/src/loop_iterable.py
+++ b/nac3standalone/demo/src/loop_iterable.py
@@ -1,7 +1,7 @@
 # For Loop using a list as its iterable
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 def run() -> int32:
diff --git a/nac3standalone/demo/src/loop_mutate_var.py b/nac3standalone/demo/src/loop_mutate_var.py
index 3ac5c2c..b884aa0 100644
--- a/nac3standalone/demo/src/loop_mutate_var.py
+++ b/nac3standalone/demo/src/loop_mutate_var.py
@@ -1,7 +1,7 @@
 # For Loop using an range() expression as its iterable, additionally reassigning the target on each iteration
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 def run() -> int32:
diff --git a/nac3standalone/demo/src/min_max_abs.py b/nac3standalone/demo/src/min_max_abs.py
index 15153fd..de3f0e2 100644
--- a/nac3standalone/demo/src/min_max_abs.py
+++ b/nac3standalone/demo/src/min_max_abs.py
@@ -1,17 +1,17 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 @extern
-def output_uint32(x: uint32):
+def output_uint32(x: uint32, newline: bool=True):
     ...
 @extern
-def output_int64(x: int64):
+def output_int64(x: int64, newline: bool=True):
     ...
 @extern
-def output_uint64(x: uint64):
+def output_uint64(x: uint64, newline: bool=True):
     ...
 @extern
-def output_float64(x: float):
+def output_float64(x: float, newline: bool=True):
     ...
 
 
diff --git a/nac3standalone/demo/src/operators.py b/nac3standalone/demo/src/operators.py
index 0470b96..3381890 100644
--- a/nac3standalone/demo/src/operators.py
+++ b/nac3standalone/demo/src/operators.py
@@ -1,19 +1,19 @@
 from __future__ import annotations
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 @extern
-def output_uint32(x: uint32):
+def output_uint32(x: uint32, newline: bool=True):
     ...
 @extern
-def output_int64(x: int64):
+def output_int64(x: int64, newline: bool=True):
     ...
 @extern
-def output_uint64(x: uint64):
+def output_uint64(x: uint64, newline: bool=True):
     ...
 @extern
-def output_float64(x: float):
+def output_float64(x: float, newline: bool=True):
     ...
 
 def run() -> int32:
diff --git a/nac3standalone/demo/src/option.py b/nac3standalone/demo/src/option.py
index 8cc0d5a..099496e 100644
--- a/nac3standalone/demo/src/option.py
+++ b/nac3standalone/demo/src/option.py
@@ -1,5 +1,5 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 class A:
diff --git a/nac3standalone/demo/src/pow.py b/nac3standalone/demo/src/pow.py
index d17abd7..0dc868d 100644
--- a/nac3standalone/demo/src/pow.py
+++ b/nac3standalone/demo/src/pow.py
@@ -1,5 +1,5 @@
 @extern
-def output_float64(f: float):
+def output_float64(f: float, newline: bool=True):
     ...
 
 
diff --git a/nac3standalone/demo/src/recursive_type.py b/nac3standalone/demo/src/recursive_type.py
index 1444f5a..325fdff 100644
--- a/nac3standalone/demo/src/recursive_type.py
+++ b/nac3standalone/demo/src/recursive_type.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 @extern
-def output_int32(a: int32):
+def output_int32(a: int32, newline: bool=True):
     ...
 
 class A:
diff --git a/nac3standalone/demo/src/tuple.py b/nac3standalone/demo/src/tuple.py
index f71d3f9..f2fa68a 100644
--- a/nac3standalone/demo/src/tuple.py
+++ b/nac3standalone/demo/src/tuple.py
@@ -1,9 +1,9 @@
 @extern
-def output_int32_list(x: list[int32]):
+def output_int32_list(x: list[int32], newline: bool=True):
     ...
 
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 class A:
diff --git a/nac3standalone/demo/src/typevar.py b/nac3standalone/demo/src/typevar.py
index 9b06221..c698cfb 100644
--- a/nac3standalone/demo/src/typevar.py
+++ b/nac3standalone/demo/src/typevar.py
@@ -1,5 +1,5 @@
 @extern
-def output_int32(x: int32):
+def output_int32(x: int32, newline: bool=True):
     ...
 
 class A: