C++ Iteration Problem?

Question

Hello!! I would like to know where to stop a loop that is used to solve a set of linear equations. Generally, it is stopped when x1-x0<0.001 or sumthin like that. Any c++ statement to help??

Some problems I am having are:
- Some of the values do not converge.
- Some of the values are negative.
How do I check for these in an IF statement??
Note: x2-x1 gives the value that is checked for convergence and the maximum iterations allowed is 15.

Answer 1

if you are using a "while" or "do while" loop

while ((x1 - x0) > 0.001)
{
//your code here
}

or you can do this

do
{
//your code here
}
while ((x1 - x0) > 0.001);