Identify all the errors in the following repetitive statements.

while (z < 1 && z > 100)
{
    a = b;
}

Convert the following for loop statement into the corresponding while loop and do-while loop:

int	sum = 0;
for	(int i= 0; i <= 100; i++)
    sum = sum + i;

Identify all the errors in the following repetitive statements.

while (x == y)
{
    xx = yy;
    x = y;
}

What are the differences between while loop and do-while loop?