Multiple assignment in one line

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Remember that assignment is done right to left, and that they are normal expressions. So from the compilers perspective the line

sample1 = sample2 = 0;

is the same as

sample1 = (sample2 = 0);

which is the same as

sample2 = 0;
sample1 = sample2;

That is, sample2 is assigned zero, then sample1 is assigned the value of sample2. In practice the same as assigning both to zero as you guessed.

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