如何在C++中显示每10个数字的一行?

我试图每显示10个数字就插入一行,但当我运行此命令并输入-29和29时,没有一行显示。请帮忙,谢谢

int start;
int end;
     
do 
{
    cout << "Please enter a number between -30 and 0: ";
    cin >>start;
} while(start > 0 || start < -30);
    
do 
{
    cout << "Pleaes enter a number between 15 and 30: ";
    cin >> end;
} while(end < 15 || end > 30);
        
for (int i = start; i <= end; i++)
{
    if (i++ % 10 == 0)
    {
        cout << "----------"<<endl;
    }
    else
        cout << start << " " << end <<endl;
}