How to calculate absolute value in c++

There are three ways to find the absolute value in C: Use the abs() function to calculate the absolute value of any type of number. Using the std::abs() function, you can calculate the absolute value of integers, floating point numbers, and complex numbers. Manual calculation of absolute values, suitable for simple integers.

How to find the absolute value in C

There are the following methods to get the absolute value in C:

1. Use the abs() function

abs() function is used to calculate the absolute value of any type of number. It is defined in the header file, accepts a parameter and returns the absolute value of the parameter. For integers, it returns an unsigned integer, and for floating point numbers, it returns a double.

#include <cstdlib>

int main() {
  int num = -10;
  double num2 = -3.14;

  std::cout << "绝对值：" << abs(num) << std::endl;  // 输出：10
  std::cout << "绝对值：" << abs(num2) << std::endl;  // 输出：3.14
}

2. Use std::abs() function

std::abs() function is an overloaded version in the C standard library and is used for calculations The absolute value of integers, floating point numbers, and complex numbers. Similar to the abs() function, it is also defined in the header file.

#include <cstdlib>

int main() {
  int num = -10;
  double num2 = -3.14;
  std::complex<double> num3(-2, 3);

  std::cout << "绝对值：" << std::abs(num) << std::endl;  // 输出：10
  std::cout << "绝对值：" << std::abs(num2) << std::endl;  // 输出：3.14
  std::cout << "绝对值：" << std::abs(num3) << std::endl;  // 输出：3.60555
}

3. Manually calculate the absolute value

For simple integers, you can write the absolute value by hand by using the conditional operator:

int my_abs(int num) {
  return (num >= 0) ? num : -num;
}

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