<div style="text-align: right">``To have another language is to possess a second soul.''<br>-- Charlemagne</div>

## **資料型別、變數宣告、運算子**

| 語言 | C | C++ | Java | Python |
| ------ | ------------------------------ | ------ | ------ | -------------- |
| 整數 | int | int | int | int |
| | long | long | long | |
| 浮點數 | float | float | float | float |
| | double | double | double | |
| 字元 | char | char | char | |
| 字串 | "NTU" = { 'N', ''T, 'U', '\0'} | "NTU" | "NTU" | 'NTU' or "NTU" |
| 邏輯 | 0 | true | true | True |
| | 1 | false | false | False |

### 算術運算子

| 語言 | C | C++ | Java | Python |
| ------ | ------------------------------ | ------ | ------ | -------------- |
| 加減乘 | $a + b$; $a - b$; $a * b$ | $a + b$; $a - b$; $a * b$ | $a + b$; $a - b$; $a * b$ | $a + b$; $a - b$; $a * b$ |
| 餘數 | a % b | a % b | a % b | a % b |
| 商 | a / b | a / b | a / b | a // b |
| 比例 | a / b | a / b | a / b | a / b |
| 指數 | ||| a ** b |

## **基本輸入輸出**

### C

    int x;
    scanf("%d", &x);
    printf("%d\n", 2 * x);

### C++

    int x;
    cin >> x;
    cout << 2 * x << endl;

### Java

    int x;
    Scanner console = new Scanner(System.in);
    x = console.nextInt();
    System.out.println(2 * x);

### Python

    x = input("Enter x? ")
    print(2 * x);

## **流程控制**

### C, C++, Java, (C#, JavaScript)

    // if - else if - else
    int a = 1;
    if (a > 0) {
        a = 10;
    } else if (a < 0) {
        a = -10;
    } else {
        a = 0;
    }

    // switch - case - break - default
    switch (a) {
        case 0:
            a = 0;
            break;
        case 1:
            a = 10;
            break;
        default:
            a = -1;            
    }

    // for loop
    int sum = 0;
    for (int i = 1; i <= 10; i++) {
        sum += i;
    }

    // while loop
    int x = 1;
    while (x < 1000) {
        x *= 2;
    }

### Python

    # if - else
    if a > b:
        max = a
    elif:
        max = b
    else:
        print("a == b")
    
    max = a if a > b else b
    
    # for loop
    sum = 0
    for i in range(1, 10 + 1):
        sum += i
        
    # while loop
    x = 1
    while (x < 1000):
        x *= 2

## **函式**

## **物件導向**