C或C ++库函数double fabs(double x)返回x的绝对值。x-这是浮点值。此函数返回x的绝对值。以下是fabs()
函数的声明。
double fabs(double x)
以下示例显示了fabs()
方法的用法。
#include <iostream> #include <cmath> using namespace std; int main () { int a, b; a = 1234; b = -344; cout << "The absolute value of " << a << " is " << fabs(a) << endl; cout << "The absolute value of " << b << " is " << fabs(b) << endl; return(0); }
输出结果
The absolute value of 1234 is 1234 The absolute value of -344 is 344