sudo port install python
port installed | grep python
sudo port select --set python python36 (or python27)
Success message: "Selecting 'python36' for 'python' succeeded. 'python36' is now active."
sudo port install py36-pip (or py27-pip) port select --set pip pip36
int factorial(int n)
{
if (1 == n) return 1;
if (0 == n) return 1;
return n * factorial(n-1);
}
int factorial_acc(int n, int acc = 1)
{
if (n == 1)
return acc;
else
return factorial_acc(n - 1, n * acc);
}
int factorial_iterative(int n)
{
int acc = 1;
if (n <= 1) return acc;
while (n > 1)
{
acc *= n;
n--;
}
return sum;
}
| 分類 | 指令 | 用途 |
|---|---|---|
| 移動 | Ctrl-A | 移到最前面 |
| Ctrl-a | 移到最前面 | |
| Ctrl-e | 移到最後面 | |
| Ctrl-u | 清除游標前指令 | |
| Ctrl-k | 清除游標後指令 | |
| 螢幕操作 | Ctrl-l | 清除畫面 |
| 常用指令 | history | 顯示歷史操作, !num可執行該行指令 |
| df -h | 顯示空間容量 | |
| ln -s fileName linkName | 建立 symoblic link to fileName | |
| wc -l | word count | |
| uname -a | show kernel info |