Hamming: improve error reporting

exercism · Jan 19, 2024 · 92ae376 · 92ae376
1 parent bfd063d
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Showing 3 changed files with 21 additions and 13 deletions.
diff --git a/exercises/practice/hamming/.docs/instructions.append.md b/exercises/practice/hamming/.docs/instructions.append.md
@@ -2,9 +2,9 @@
 
 ## Registers
 
-| Register | Usage     | Type    | Description                    |
-| -------- | --------- | ------- | ------------------------------ |
-| `$a0`    | input     | address | first, null-terminated, string |
-| `$a1`    | input     | address | first, null-terminated, string |
-| `$v0`    | output    | integer | hamming distance               |
-| `$t0-9`  | temporary | any     | for temporary storage          |
+| Register | Usage     | Type    | Description                     |
+| -------- | --------- | ------- | ------------------------------- |
+| `$a0`    | input     | address | first, null-terminated, string  |
+| `$a1`    | input     | address | second, null-terminated, string |
+| `$v0`    | output    | integer | hamming distance                |
+| `$t0-9`  | temporary | any     | for temporary storage           |
diff --git a/exercises/practice/hamming/impl.mips b/exercises/practice/hamming/impl.mips
@@ -1,9 +1,9 @@
-# | Register | Usage     | Type    | Description                    |
-# | -------- | --------- | ------- | ------------------------------ |
-# | `$a0`    | input     | address | first, null-terminated, string |
-# | `$a1`    | input     | address | first, null-terminated, string |
-# | `$v0`    | output    | integer | hamming distance               |
-# | `$t0-9`  | temporary | any     | for temporary storage          |
+# | Register | Usage     | Type    | Description                     |
+# | -------- | --------- | ------- | ------------------------------- |
+# | `$a0`    | input     | address | first, null-terminated, string  |
+# | `$a1`    | input     | address | second, null-terminated, string |
+# | `$v0`    | output    | integer | hamming distance                |
+# | `$t0-9`  | temporary | any     | for temporary storage           |
 
 .globl hamming_distance
 

diff --git a/exercises/practice/hamming/runner.mips b/exercises/practice/hamming/runner.mips
@@ -69,7 +69,15 @@ exit_fail:
         li      $v0, 4                  # 4 is print string
         syscall
 
-        move    $a0, $s1                # print input that failed on
+        move    $a0, $s1                # print input that failed on, first strand
+        li      $v0, 4
+        syscall
+
+        la      $a0, comma              # put address of comma into a0
+        li      $v0, 4                  # 4 is print string
+        syscall
+
+        move    $a0, $s2                # print input that failed on, second strand
         li      $v0, 4
         syscall