Add 'labs/' from commit '58cd0413b229aea4bad859401adb7f4cb8f4474d'

git-subtree-dir: labs
git-subtree-mainline: 4d409d3106
git-subtree-split: 58cd0413b2

labs/01_datalab/tests.c

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+/* Testing Code */
+
+#include <limits.h>
+#include <math.h>
+
+/* Routines used by floation point test code */
+
+/* Convert from bit level representation to floating point number */
+float u2f(unsigned u) {
+  union {
+    unsigned u;
+    float f;
+  } a;
+  a.u = u;
+  return a.f;
+}
+
+/* Convert from floating point number to bit-level representation */
+unsigned f2u(float f) {
+  union {
+    unsigned u;
+    float f;
+  } a;
+  a.f = f;
+  return a.u;
+}
+
+/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+/* This header is separate from features.h so that the compiler can
+   include it implicitly at the start of every compilation.  It must
+   not itself include <features.h> or any other header that includes
+   <features.h> because the implicit include comes before any feature
+   test macros that may be defined in a source file before it first
+   explicitly includes a system header.  GCC knows the name of this
+   header in order to preinclude it.  */
+/* glibc's intent is to support the IEC 559 math functionality, real
+   and complex.  If the GCC (4.9 and later) predefined macros
+   specifying compiler intent are available, use them to determine
+   whether the overall intent is to support these features; otherwise,
+   presume an older compiler has intent to support these features and
+   define these macros by default.  */
+/* wchar_t uses Unicode 10.0.0.  Version 10.0 of the Unicode Standard is
+   synchronized with ISO/IEC 10646:2017, fifth edition, plus
+   the following additions from Amendment 1 to the fifth edition:
+   - 56 emoji characters
+   - 285 hentaigana
+   - 3 additional Zanabazar Square characters */
+//1
+int test_bitAnd(int x, int y)
+{
+  return x&y;
+}
+int test_bitXor(int x, int y)
+{
+  return x^y;
+}
+int test_isTmin(int x) {
+    return x == 0x80000000;
+}
+//2
+int test_isEqual(int x, int y)
+{
+  return x == y;
+}
+int test_negate(int x) {
+  return -x;
+}
+int test_getByte(int x, int n)
+{
+    unsigned char byte;
+    switch(n) {
+    case 0:
+      byte = x;
+      break;
+    case 1:
+      byte = x >> 8;
+      break;
+    case 2:
+      byte = x >> 16;
+      break;
+    default:
+      byte = x >> 24;
+      break;
+    }
+    return (int) (unsigned) byte;
+}
+//3
+int test_isLess(int x, int y)
+{
+  return x < y;
+}
+int test_conditional(int x, int y, int z)
+{
+  return x?y:z;
+}
+//4
+unsigned test_floatScale2(unsigned uf) {
+  float f = u2f(uf);
+  float tf = 2*f;
+  if (isnan(f))
+    return uf;
+  else
+    return f2u(tf);
+}
+int test_floatFloat2Int(unsigned uf) {
+  float f = u2f(uf);
+  int x = (int) f;
+  return x;
+}