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Message: [QUOTE="Christian Bau, post: 1682621"] What is the type of ((Stochastic) ? var.i : var.f) ? The type of var.i is int. The type of var.f is double. Whatever value is picked depending on the value of Stochastic, will then be converted according to the "usual arithmetic conversion"s to type double, and that is the type of result. %lu is the wrong format to print a double value. You get undefined behavior, which causes the rather interesting output. Use a double format instead. Here you convert the double value to unsigned long, so you use %lu to print an unsigned long value. Everything is fine here. If var.f had a fractional part and Stochastic is zero then the fractional part would be lost. [/QUOTE]