Suppose that a String variable str has already been defined and holds some String.

In the box provided below, write a statement that changes str to all lower case characters, and then copies the result back to str.

It depends on the language used, for example,

Java:
str=str.toLowerCase();

VB:
str=LCase(str)
or
str=str.ToLower()
or
str=StrConv(str,VbStrConv.LowerCase)

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To change a String variable to all lower case characters and store the result back to the same variable, you can use the following statement:

```java
str = str.toLowerCase();
```
In this statement, the `toLowerCase()` method is called on the `str` variable, which returns a new String with all characters converted to lower case. By assigning this new String back to the `str` variable, it effectively changes the original value of `str` to all lower case.