function cphasef( z ) {
	return atan2f( imagf( z ), realf( z ) );
}
Computes the argument of a single-precision complex floating-point number in radians.

@param {Complex64} z - complex number
@returns {number} argument

@example
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var phi = cphasef( new Complex64( 5.0, 3.0 ) );
// returns ~0.5404