Temp: Sieve Of Eratosthenes

#include<iostream>
#include<cstring>
using namespace std;
#define MAX 100
bool arr[MAX];
int main() {
    void sieve(unsigned long int);
    unsigned long int n,m,i;
    int t;
    sieve(MAX);
    cin>>t;
    while(t--)
    {
        cin>>m;
        cin>>n;
        for(i=m;i<=n;i++)
        {
            if(arr[i]==true)
            {
                cout<<arr[i]<<endl;
            }
        }
    }
    return 0;
}
void sieve(unsigned long int n)
{
    unsigned int j;
    memset(arr,true,sizeof(arr));
    for(unsigned long int i=2;i*i<=n;i++)
    {
        if(arr[i]==true)
        {
            for(j=i*2;j<=n;j+=i)
            {
                arr[j]=false;
            }
        }
    }
}