The difference between while and do while C++? [duplicate]

Answer 1

The while loop first evaluates number < 10 and then executes the body, until number < 10 is false.

The do-while loop, executes the body, and then evaluates number < 10, until number < 10 is false.

For example, this prints nothing:

int i = 11;

while( i < 10 )
{
    std::cout << i << std::endl;
    i++;
}

But this prints 11:

int j = 11;

do
{
    std::cout << j << std::endl;
    j++;
}
while( j < 10 );