Can you please go through the code its not printing output

#1
#2

bool prime_num(int n){
for(int i=2;i<=n;i++){
if(n%i==0){
return false;
}
}
return true;
}
in this function
for(int i=2;i<=n;i++){
when i=n then n%n=0 which is always true hence it always return false hence no printing anything
you can write is as: for(int i=2;i<n;i++){
but it is not perfect
ideally we have to go till sqrt(n)

#3

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