# Error handling

### Try catch statement

By default, if an error was received at the time of the script execution, the script immediately finishes its work. If you want to avoid the termination of the script, you should use the **try** statement. If an error occurs during the execution of the code inside the *try* block, the control will pass to the **catch** block, which must be after **try**. After the *catch* keyword, it is necessary to specify the name of the variable of *error* type, which will contain information about the error. You can use \[special functions] (<https://gentee.github.io/stdlib/runtime#erriderror-err-int>) to get the identifier and error text. If you do not remove the error inside *catch* with **recover** or **retry**, it will be passed on and the script will finish its work.

```
TryStmt ="try" Block CatchStmt
CatchStmt = "catch" identifier Block
```

```
run  {
   try {
      myfunc()
      error(101, "Custom error")
   }
   catch err {
      if ErrID(err) != 101:  error( 102, "Error \{ErrText(err)} has occurred in myfunc()")
   } 
}
```

### Recover statement

The **recover** statement is used inside a **catch** block to remove the error. This command removes the error information, the script exits the current *catch* block and continues execution.

```
RecoverStmt = "recover"
```

```
run str {
   try : 10/0
   catch err :  recover
   return "ok"
} 
// ok
```

### Retry statement

The **retry** statement is used inside a **catch** block to restart **try**. This command removes the error information and the script re-executes the corresponding *try* block.

```
RetryStmt = "retry"
```

```
run {
   str fname
   try {
       fname = ReadString("Specify filename: ")
       Println("Beginning of the file: ", str(ReadFile(fname, 0, 50)))
    } catch err {
       Println("ERROR #\{ErrID(err)}: \{ErrText(err)}")
       retry
    }
}
```

##


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