更新

Author: xinetzone

doc/exercises/frexp.ipynb

@@ -25,7 +25,7 @@
     "- `x`：浮点值。\n",
     "- `expptr`：指向存储的整数指数的指针。\n",
     "\n",
-    "{func}`frexp` 返回尾数。 如果 `x` 为 `0`，则该函数将返回 `0` 表示尾数和指数。 `NULL` 如果是 `expptr`，则调用无效的参数处理程序，如参数验证中所述。 如果允许执行继续，则该函数将 `errno` 设置为 `EINVAL` 并返回 `0`。\n",
+    "{func}`frexp` 返回尾数。 如果 `x` 为 `0`，则该函数将返回 `0` 表示尾数和指数。如果 `expptr` 是 `NULL`，则调用无效的参数处理程序，如参数验证中所述。 如果允许执行继续，则该函数将 `errno` 设置为 `EINVAL` 并返回 `0`。\n",
     "\n",
     "```{note}\n",
     "`frexp` 函数将浮点值（`x`）分解为尾数（mantissa `m`）和指数（exponent，`n`），使绝对值 `m` 大于或等于 `0.5` 且小于 `1.0`，并且 $x = m * 2^n$。整数指数 `n` 存储在由 `expptr` 指向的位置。\n",
@@ -63,154 +63,27 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": 7,
+   "cell_type": "markdown",
    "metadata": {
     "vscode": {
      "languageId": "c++"
     }
    },
-   "outputs": [],
    "source": [
-    "double x = 2.302585093;\n",
-    "double y;\n",
-    "\n",
-    "y = exp(x);"
+    "将双精度有效数字转换为整数有效数字，即将小数点放在第 31 位和第 30 位之间。这是通过将双精度值乘以 $2^{31}$，然后将其转换为 int 来实现的。"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 3,
    "metadata": {
     "vscode": {
      "languageId": "c++"
     }
    },
    "outputs": [],
    "source": [
-    "double sigmoid(double x) {\n",
-    "    return 1/(1+exp(-x));\n",
-    "}"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 11,
-   "metadata": {
-    "vscode": {
-     "languageId": "c++"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "0.73105858"
-      ]
-     },
-     "execution_count": 11,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "sigmoid(1)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 12,
-   "metadata": {
-    "vscode": {
-     "languageId": "c++"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "0.50000000"
-      ]
-     },
-     "execution_count": 12,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "sigmoid(0)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 13,
-   "metadata": {
-    "vscode": {
-     "languageId": "c++"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "2.0000000"
-      ]
-     },
-     "execution_count": 13,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "1/(0.5)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 14,
-   "metadata": {
-    "vscode": {
-     "languageId": "c++"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "0"
-      ]
-     },
-     "execution_count": 14,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "1/2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 16,
-   "metadata": {
-    "vscode": {
-     "languageId": "c++"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "50.000000"
-      ]
-     },
-     "execution_count": 16,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "0.5 * 100"
+    "significand_d = std::round(significand_d * (1ll << 31));"
    ]
   },
   {

doc/exercises/sigmod.cc

@@ -0,0 +1,10 @@
+double x = 2.302585093;
+double y;
+
+y = exp(x);
+
+double sigmoid(double x) {
+    return 1/(1+exp(-x));
+}
+
+sigmoid(1)

doc/wiki/ifndef.ipynb

@@ -14,7 +14,11 @@
   {
    "cell_type": "code",
    "execution_count": 1,
-   "metadata": {},
+   "metadata": {
+    "vscode": {
+     "languageId": "c++"
+    }
+   },
    "outputs": [],
    "source": [
     "#ifndef HEADER_H\n",
@@ -45,7 +49,7 @@
    "codemirror_mode": "text/x-c++src",
    "file_extension": ".cpp",
    "mimetype": "text/x-c++src",
-   "name": "c++",
+   "name": "C++14",
    "version": "14"
   }
  },