Find Prime numbers in a range

PROBLEM :
Generate all prime numbers between two given numbers.

Input:
The first line of the input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case consists of a single line containing two space separated integers m and n.

Output:
For every test case print all prime numbers p such that m <= p <= n, space separated. Separate the answers for each test case by a new line.

Constraints:
1<=T<=60
1 <= m <= n <= 100000,
n - m <= 100000

Example:
Input:
2
1 10
3 5

Output:
2 3 5 7
3 5

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
void Prime_numbers_range(int ,int ) ;
int main()
{
    int t,n1,n2 ;
    cin>>t ;
    while(t--)
    {
        cin>>n1>>n2 ;
        Prime_numbers_range(n1,n2) ;
        cout<<endl ;
    }
return 0;
}

void Prime_numbers_range(int n1,int n2)
{
    int arr[n2] ;
    int i,j ;
   
    arr[0]=0 ;
    arr[1]=0 ;
    for(i=2;i<=n2;i++)
        arr[i]=1 ;
       
    for(i=2;i<=n2;i++)
    {
        if(arr[i]==1)
        {
            for(j=i+1;j<=n2;j++)
                if(j%i==0)
                    arr[j]=0 ;
        }
    }
   
    for(i=n1;i<=n2;i++)
        if(arr[i]==1)
            cout<<i<<" " ;
}

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