Obtains the absolute value of a complex number #include <complex.h> double cabs ( double complex z ); float cabsf ( float complex z ); long double cabsl ( long double complex z ); For a complex number z = x + y x i, where x and y are real numbers, cabs(z) is equal to the square root of x^{2} + y^{2}, or hypot(x,y). The result is a non-negative real number. ExampleThe absolute value of a complex number is its absolute distance from the origin in the complex planein other words, a positive real number, as this example demonstrates: double complex z[4]; z[0] = 3.0 + 4.0 * I; z[1] = conj( z[0] ); z[2] = z[0] * I; z[3] = -( z[0] ); for (int i = 0; i < 4 ; i++ ) { double a = creal(z[i]); double b = cimag(z[i]); printf ( "The absolute value of (%4.2f %+4.2f x I) is ", a, b ); double absolute_z = cabs(z[i]); printf ( "%4.2f.\n", absolute_z ); } The output of the sample code is as follows: The absolute value of (3.00 +4.00 x I) is 5.00. The absolute value of (3.00 -4.00 x I) is 5.00. The absolute value of (-4.00 +3.00 x I) is 5.00. The absolute value of (-3.00 -4.00 x I) is 5.00. See Alsocimag( ), creal( ), carg( ), conj( ), cproj( ) |