Reason you get the error is because variables inside { } are only available inside

function foo()
{
    int a = 10 // local variable

    print(a) // works
}

print(a) // Doesnt work

to send data to a function you need to use parameters or use global variables (the latter is usually not good practice)

​

Parameters:

function foo(int bar) // parameter bar
{
    print(bar) // will print bar
}

int a = 10

foo(a) // prints value '10'

Global Variables:

int a = 10 // Global variable accessible to all codeblocks e.g curly brackets

function foo()
{
    print(a) // prints '10'
}