# 조건문

Soulver에서 조건문은 한 줄에 표현됩니다:

```
earnings = $45k                                 | $45,000.00

if earnings > $30k then tax = 20% else tax = 5% | 20%

My tax paid: earnings × tax                     | $9,000.00
```

**조건문을 사용하여 변수 선언하기**

```
income = $35k
expenses = $21.5k

profitable = true if income > expenses     | true
insolvent = false unless expenses > income | false
```

**조건문에서 "and"와 "or" 사용하기**

```
BMI = 24
Underweight = BMI < 18.5                  | false
Healthy Weight = BMI >= 18.5 and BMI < 25 | true
Overweight = BMI >= 25 and BMI < 30       | false
Obese = BMI >= 30                         | false
```

{% hint style="info" %}
&&와 ||도 지원됩니다
{% endhint %}

#### 비교 연산자 및 불리언

Soulver는 표준 ["C" 스타일](https://en.wikipedia.org/wiki/C_\(programming_language\)) 비교 연산자를 지원합니다.

불리언 값(`true` 또는 `false`)이 반환됩니다.

| Name                     | Operator |
| ------------------------ | -------- |
| Equal to                 | ==       |
| Not equal to             | !=       |
| Greater than             | >        |
| Less than                | <        |
| Greater than or equal to | >=       |
| Less than or equal to    | <=       |

변수에 불리언 값을 직접 할당할 수 있습니다.

```
cost = $500                                 
discount = true                        
if discount then cost = cost - 10%
cost | $450.00
```

또한 if문 외부에서도 비교 연산자를 사용할 수 있습니다.

```
20km == 20,000 m   | true
11:30 am < 9:30 am | false
```


---

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