can someone to expalin me this code $?$ #include

#include

#include

#include

#include

int main$()\{$

FILE $*$filename $=$ fopen $("$writeToFile$.$dat", $"$w$")$;

if $($fork $()==0)\{$

for $($int i $=0$; i $<3$; i$++)\{$

printf $("$First child P$1$

$")$;

fprintf $($f$,$ "First child P$1$

$")$;

$\}$

$\}$

else if $($fork $()==0)\{$

for $($int i $=0$; i $<2$; i$++)\{$

printf $("$Second child P$2$

$")$;

fprintf $($f$,$ "Second child P$2$

$")$;

$\}$

$\}$

else if $($fork $()==0)\{$

printf $("$Third child P$3$

$")$;

fprintf $($f$,$ "Third child P$3$

$")$;

$\}$

else $\{//$ Parent

wait $($NULL$)$; $//$ wait for one child to finish

wait $($NULL$)$; $//$ wait for another child to finish

wait $($NULL$)$; $//$ wait for last child to finish

fclose $($f$)$;

$\}$

return $0$;

$\}$