in C language

Is the below pass by reference or value for the arrays in the parameter list?

$//$function declaration for sum

int sum$($int intMyIntArray$[],$ int intSize$1,$ char myCharArray$[],$ int intSize$2)$

$\{$

$//$ sum calculation stub to be implemented later

$\}$

void main$($void$)$

$\{$

int intMyIntArray$[20]$;

char myCharArray$[20]$;

sum$($ intMyIntArray, $20,$ myCharArray, $20)$;

$\}$