What does fabs mean in c++

fabs() function is a mathematical function in C that calculates the absolute value of a floating point number, removes the negative sign and returns a positive value. It accepts a floating point parameter and returns an absolute value of type double. For example, fabs(-5.5) returns 5.5. This function works with floating point numbers, whose accuracy is affected by the underlying hardware.

fabs() function in C

What is the fabs() function?

fabs() function is a mathematical function defined in the C standard library and is used to calculate the absolute value of floating point numbers. Absolute value represents the positive value of a number and removes the negative sign for negative numbers.

Usage:

fabs() function accepts a floating point parameter and returns its absolute value. The syntax is as follows:

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

Return value:

fabs() function returns a double type value, representing the absolute value of the parameter num.

Example:

<code class="cpp">#include <cmath>

int main() {
  double num1 = -5.5;
  double num2 = 12.34;

  double abs_num1 = std::fabs(num1); // abs_num1 = 5.5
  double abs_num2 = std::fabs(num2); // abs_num2 = 12.34

  return 0;
}</code>

Note:

• fabs() function can only be used for floating point numbers. If you pass a non-floating point argument, the function behavior is undefined.
• fabs() function returns a value of type double, even if the argument is of type float.
• The accuracy of the fabs() function depends on the underlying hardware. For very large or very small numbers, the result may be a loss of precision.

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