please.... give an example of a returnable data type function

Answer 1

You can return data of any type.

Example: a foo() function returning an integer:
public static int foo() {
return 42;
}

Answer 2

int sum(int a, int b)"{return a + b}
int result = sum(4, 6);

Answer 3

class MyClass {

static int sum(int val1, int val2) {
return val1 + val2;
}

public static void main(String[ ] args) {

System.out.println(sum(5, 5));
}
}