PRIME1 - Prime Generator, cant get output

[Tafseer_Ahmed]

#include <iostream>
#include <cmath>
using namespace std;
void prime(int a,int b)
{	int flag;
	int n=b-a-1;
	for (int i=0;i<n;i++)
	{
		flag=0;
		for(int j=2;j<=sqrt(a+i+1);j++)
		{
			if((a+i+1)%j==0)
			{
				flag=1;
				break;
			}
		}
		if (flag=0)
		{
			cout<<a+i<<endl;
		}
	}
}
int main() {
	int t,x,y;
	cin>>t;
	while(t>0)
	{
		cin>>x>>y;
		prime(x,y);
		t--;
	}
	return 0;
}

Input:
2
1 10
3 5
but
Output:

is blank. Where am i going wrong? Thanks in advance.

[leppyr64]

if (flag=0)

This code sets flag equal to zero, which returns zero and therefore does not execute the if result. You should use ==