strange effect: if ... else in C influence a previous statement

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# 8  
double, the expression is one such as +-/*
It is sure that the lf_lese_ structure is compiled before y2 is actually assigned.
The compilation will make effect on y2? but before y2 is assigned, 'p y2' can not give a value.
May you list the common possilbe causes of the faults? I consulted about it but many people do not know how to interprete it.
# 9  
I ran into several situations similar to this question.

Is it wise to avoid inplementing complicated algorithm in a function?

What skills help overcome such troubles?
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