How to enter blank line after test case

#1

please explain me in detail how to enter blank line after testcases.

#2

just put cout<<endl;

you can use this template

#include <iostream>
using namespace std;
void solve(){
    // solve your question here
}
int main() {
    int t;cin>>t;
    while(t--){

        // DO THE WORK FOR EACH TEST CASE HERE OR CALL A FUNCTION SOLVE
        solve();

        cout<<endl;
    }
}