what is wrong with my code

int integerA;

int integerB;

cin $>>$ integerA;

cin $>>$ integerB;

if$($integerA $<=0||$ integerB $<=0)\{$

cout $<<$ "Both numbers must be greater than $0."<<$ endl;

return $1$;

$\}$

while$($integerA $!=$ integerB$)\{$

if$($integerA $>$ integerB$)\{$

integerA $=$ integerA $-$ integerB;

$\}$ else $\{$

integerB $=$ integerB $-$ integerA;

$\}$

$\}$

cout $<<$ a $<<$ endl;