What is the error in the following code

int int $a=0,$ int $b=0,$int $c$

$\{$at$=$b$*$c; return $a$;

int main$()$

$($F$(1)$;

return $0$;

$1$

a$.$ calling statement error, it must have $3$ parameters

b$.$ erfor of multiplication operation with $+$ operation

c$.$ All

d$.$ Function parameters cant assigned values

e$.$ error of defualt arguments that preceed obligatory arguments