What does x+=x-=x*x mean in C language

In C language, x =x-=x*x

In C language, x =x-=x*x is a compound assignment statement, which Equivalent to the following two statements:

<code class="C">x = x + x;
x = x - (x * x);</code>

Execution steps:

1. Add the current value of x to x itself to get the new x value.
2. Multiply the new x value by the square of x to get an intermediate value.
3. Subtract the middle value from the new x value to get the final x value.

Equivalent expression:

• x x - x * x
• x * (2 - x)

Application scenarios:

This compound assignment statement is usually used to shorten the code length, and in some specific scenarios It can improve code efficiency, for example:

• Calculate the squared difference: x x - y y is equivalent to x =x-=y*y.
• Calculate the roots of the quadratic equation: x = (-b ± sqrt(b b - 4 a c)) / 2a is equivalent to x =x-=(- b -sqrt(bb-4ac))/(2*a).

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