Insert in Queue

#‎include‬
using namespace std;
int main()
{
cout<<"Insert element in a quee: source Code"<<endl;
int a[5]={1,2,3,4},i,item=5;

for(i=0;i<5;i++)
{
if(a[i]=='\0')
{
a[i]=item;
}
}
for(i=0;i<5;i++){
cout<<a[i]<<endl;
}
return 0;
}