Swapping the two variables with some given values.

I happen to know of other methods used to swap two variables like addition and subtraction, bitwise and so on. But I want to know why this method does not give correct result. The code is meant for C language. Since && is a sequence point the first b should return 7 and second one should be assigned to 15?

By that virtue output shouldn't it return a=7 and b=15; & is ampersand.

#ComputerScience

Easy Math Editor

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$