function csubf( z1, z2 ) {
	var re = f32( realf( z1 ) - realf( z2 ) );
	var im = f32( imagf( z1 ) - imagf( z2 ) );
	return new Complex64( re, im );
}
Subtracts two single-precision complex floating-point numbers.

@param {Complex64} z1 - complex number
@param {Complex64} z2 - complex number
@returns {Complex64} result

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

var z1 = new Complex64( 5.0, 3.0 );
var z2 = new Complex64( -2.0, 1.0 );

var out = csubf( z1, z2 );
// returns <Complex64>[ 7.0, 2.0 ]