How to use absolute value in c++

There are two ways to obtain the absolute value in C: 1. Use the built-in function abs() to obtain the absolute value of an integer or floating point type; 2. Use the generic function std::abs(), Get the absolute values ​​of various data types that support absolute value operations.

Two ways to get the absolute value in C

In C, there are two ways to get the absolute value Type:

1. Use the abs() function

abs() function is a built-in function in the C standard library, which can obtain The absolute value of an integer or floating-point number.

Syntax:

<code class="cpp">int abs(int n);
double abs(double d);</code>

For example:

<code class="cpp">int n = -5;
cout << abs(n) << endl; // 输出：5

double d = -3.14;
cout << abs(d) << endl; // 输出：3.14</code>

2. Use std::abs() function

std::abs() function is a generic function introduced in C 11, which can obtain the absolute value of any data type that supports absolute value operations.

Syntax:

<code class="cpp">template<typename T>
T abs(T value);</code>

For example:

<code class="cpp">int n = -5;
cout << std::abs(n) << endl; // 输出：5

double d = -3.14;
cout << std::abs(d) << endl; // 输出：3.14

complex<double> c(3, 4);
cout << std::abs(c) << endl; // 输出：5 (复数的模)</code>

Selection method:

• If the basic data type to be processed is integer or floating point, it is recommended to use the abs() function.
• If the data type to be processed is complex, such as complex numbers or custom types, you may consider using the std::abs() function.

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