Use this program segment to answer the True$/$False Question.

A C$++$ program contains the following statements:

void plus $($int a$,$ int & b$)$; Line $1$

int main $()$

$\{$

int x $=100$;

int y $=9999$;

plus $($x$,$ y$)$;

$..................$

$\}$

void plus $($int a$,$ int & b$)$

$\{$

$....................................$

$\}$

Question: The value of x can be modified by the plus function. $($T$/$F$)$