for (i=0;i<n;i++)
{
    ...
}

The above for structure can be transformed to a while structure:

i=0;
while (i<n)
{
    ...
    i++;
}

And following while and do-while are equivalent:

do
{
    ...;
}while (b);

{
    ...;
}
while (b)
{
    ...;
}

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