# If-else

### Твърдение If

Твърдението if се състои от условие, последвано от операции или набор от операции, както е показано по -долу:

```
if(condition){
  Statement(s);
}
```

Операторите се изпълняват само когато даденото условие е вярно. Ако условието е невярно, тогава операторите в тялото на израза се игнорират.\
![if statement flow diagram](https://beginnersbook.com/wp-content/uploads/2017/08/if_statement_flow_diagram.jpg)

#### Пример

```
public class IfStatementExample {

   public static void main(String[] args){
      int num=70;
      if( num < 100 ){
	  /* This println statement will only execute,
	   * if the above condition is true
	   */
	  System.out.println("number is less than 100");
      }
   }
}
```

**Изход:**

```
number is less than 100
```

Вложен израз на if в Java&#x20;

Когато има оператор if в друг оператор if, той се нарича вложен оператор if. Структурата на вложения if, изглежда така:

```
if(condition_1) {
   Statement1(s);

   if(condition_2) {
      Statement2(s);
   }
}
```

#### Пример:

```
public class NestedIfExample {

   public static void main(String[] args){
        int num=70;
	if( num < 100 ){ 
           System.out.println("number is less than 100"); 
           if(num > 50){
	      System.out.println("number is greater than 50");
	   }
	}
   }
}
```

**Изход:**

```
number is less than 100
number is greater than 50
```

### If else в Java

```
if(condition) {
   Statement(s);
}
else {
   Statement(s);
}
```

Блока „if“ ще се изпълни, ако условието е вярно, и блока „else“ ще се изпълнят, ако условието е невярно.\
![If else flow diagram](https://beginnersbook.com/wp-content/uploads/2017/08/If_else_flow_diagram.jpg)

#### Пример:

```
public class IfElseExample {

   public static void main(String[] args){
     int num=120;
     if( num < 50 ){
	System.out.println("num is less than 50");
     }
     else {
	System.out.println("num is greater than or equal 50");
     }
   }
}
```

**Изход:**

```
num is greater than or equal 50
```

### if-else-if в Java

if-else-if се използва, когато трябва да проверим множество условия.

```
if(condition_1) {
   /*if condition_1 is true execute this*/
   statement(s);
}
else if(condition_2) {
   /* execute this if condition_1 is not met and
    * condition_2 is met
    */
   statement(s);
}
else if(condition_3) {
   /* execute this if condition_1 & condition_2 are
    * not met and condition_3 is met
    */
   statement(s);
}
.
.
.
else {
   /* if none of the condition is true
    * then these statements gets executed
    */
   statement(s);
}
```

#### Пример:

```
public class IfElseIfExample {

   public static void main(String[] args){
	int num=1234;
	if(num <100 && num>=1) {
	  System.out.println("Its a two digit number");
	}
	else if(num <1000 && num>=100) {
	  System.out.println("Its a three digit number");
	}
	else if(num <10000 && num>=1000) {
	  System.out.println("Its a four digit number");
	}
	else if(num <100000 && num>=10000) {
	  System.out.println("Its a five digit number");			
	}
	else {
	  System.out.println("number is not between 1 & 99999");			
	}
   }
}
```

**Изход:**

```
Its a four digit number
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://programmingfundamental.gitbook.io/programmingwithjava/obektno-orientirano-programirane-1-chast/laboratorno-uprazhnenie-1/if-else.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.