Hi dealii developers,

I would like to ask(confirm)whether zero is the initial value of
different-type data, e.g. for  double, int, Vector and Tensor. For
example, if I just define double x;. Does x have an initial value of 0.0?

Moreover, in my task, I set initial values of a variable, e.g. "a",  to
be one in the whole domain. When I assemble the residual vector, I need
to first compute the value of "a" at quadrature points (which turns out
not exactly 1.0). Consequently, when I compute, e.g. "3*a^4-2*a^3+a^2",
the answer is not zero. Is it avoidable?

Best,

Chenyi

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