class queue{
int n;
int a[n];
public:
queue(int d){
n=d;
}
};
//above code always throws out an error but when ,I implement the same code dynamically it does not give me an error.
class cat{
int*a;
public:
cat(int n){
a=new int[n]; // why do we dynamically allocate it
}
}
you can try this
#include <iostream>
using namespace std;
class queue {
int n;
int a[1000];
public:
queue(int d) {
n = d;
}
};
your code snippet gives error because n is not declare at compile time
so can’t create array of unknown size
n will come into existence only when object of class is created
and object always created after class declaration
so you can’t do this int arr[n]