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:

int abs(int n); double abs(double d);

For example:

int n = -5; cout << abs(n) << endl; // 输出：5 double d = -3.14; cout << abs(d) << endl; // 输出：3.14

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:

template T abs(T value);

For example:

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

Selection method:

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

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