What does fabs mean in c++

fabs function is used to calculate the absolute value of a floating point number, that is, a non-negative value. The prototype of its function is: double fabs(double x). The parameter x is the target floating point number, and the return value is the absolute value of x, a non-negative floating point number.

The meaning of fabs in C

In C, fabs is a function used to calculate floating point numbers absolute value. Absolute value refers to the non-negative value of a number.

Function prototype:

<code class="cpp">double fabs(double x);</code>

Parameters:

• x: To calculate the absolute value The target floating point number.

Return value: The absolute value of

• x, a non-negative floating point number.

Usage:

fabs function is mainly used to calculate the absolute value of floating point numbers. For example, suppose there is a floating point variable num with a value of -3.14. You can use the fabs function to calculate its absolute value:

<code class="cpp">double num = -3.14;
double absolute_value = fabs(num); // absolute_value 的值为 3.14</code>

In this example, absolute_value Will contain the absolute value of num, which is 3.14.

Note:

• fabs function can only be used for floating point numbers. For integers, the abs function should be used.
• fabs function does not modify the value of the original variable. It only returns results.
• fabs The parameters and return value of the function are double-precision floating point numbers.

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