move remaining stuff from testcode/lib/ one level up to testcode/

testcode/div-test.c

@@ -0,0 +1,45 @@
+/* div-test.c
+**
+** This program tests the division and modulo operators
+** and the div() library function.
+*/
+
+#include <cc65.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static bool test (int dividend, int divisor)
+{
+    div_t result;
+
+    result = div (dividend, divisor);
+    printf ("%+d/%+d= %+d, %+d%%%+d= %+d, div()= %+d, %+d\n",
+            dividend, divisor, dividend / divisor,
+            dividend, divisor, dividend % divisor,
+            result.quot, result.rem);
+
+    return result.quot * divisor + result.rem != dividend;
+}
+
+int main (void)
+{
+    bool t;
+
+    printf ("\nTest of division and modulus operations:\n\n");
+
+    t = test (+40, +3) ||
+        test (+40, -3) ||
+        test (-40, +3) ||
+        test (-40, -3);
+    if (t) {
+        printf ("\nThe div() function made a wrong result!\n");
+    }
+
+    if (doesclrscrafterexit ()) {
+        printf ("\nTap the Return key to quit. ");
+        getchar ();
+    }
+
+    return (int)t;
+}