feat: add math/base/special/croundnf

lib/node_modules/@stdlib/math/base/special/croundnf/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# croundnf
+
+> Round each component of a single-precision complex floating-point number to the nearest multiple of `10^n`.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var croundnf = require( '@stdlib/math/base/special/croundnf' );
+```
+
+#### croundnf( z, n )
+
+Rounds each component of a single-precision complex floating-point number to the nearest multiple of `10^n`.
+
+```javascript
+var Complex64 = require( '@stdlib/complex/float32/ctor' );
+
+var v = croundnf( new Complex64( -3.141592653589793, 3.141592653589793 ), -2 );
+// returns <Complex64>[ ~-3.14, ~3.14 ]
+
+v = croundnf( new Complex64( -3.141592653589793, 3.141592653589793 ), 0 );
+// returns <Complex64>[ -3.0, 3.0 ]
+
+v = croundnf( new Complex64( -12368.0, 12368.0 ), 3 );
+// returns <Complex64>[ ~-12000.0, ~12000.0 ]
+
+v = croundnf( new Complex64( NaN, NaN ), 3 );
+// returns <Complex64>[ NaN, NaN ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   When operating on [floating-point numbers][ieee754] in bases other than `2`, rounding to specified digits can be **inexact**. For example,
+
+    ```javascript
+    var Complex64 = require( '@stdlib/complex/float32/ctor' );
+
+    var x = 0.2 + 0.1;
+    // returns 0.30000000000000004
+
+    // Should round components to 0.3:
+    var v = croundnf( new Complex64( x, x ), -7 );
+    // returns <Complex64>[ 0.30000001192092896, 0.30000001192092896 ]
+    ```
+
+-   Ties are rounded toward positive infinity.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var uniform = require( '@stdlib/random/base/uniform' ).factory;
+var Complex64 = require( '@stdlib/complex/float32/ctor' );
+var floor = require( '@stdlib/math/base/special/floor' );
+var croundnf = require( '@stdlib/math/base/special/croundnf' );
+
+var rand1 = uniform( -5.0, 0.0 );
+var rand2 = uniform( -50.0, 50.0 );
+
+var z;
+var i;
+var n;
+for ( i = 0; i < 100; i++ ) {
+    z = new Complex64( rand2(), rand2() );
+    n = floor( rand1() );
+    console.log( 'croundnf(%s, %s) = %s', z, n, croundnf( z, n ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/math/base/special/croundnf.h"
+```
+
+#### stdlib_base_croundnf( z, n )
+
+Rounds each component of a single-precision complex floating-point number to the nearest multiple of `10^n`.
+
+```c
+#include "stdlib/complex/float32/ctor.h"
+#include "stdlib/complex/float32/real.h"
+#include "stdlib/complex/float32/imag.h"
+
+stdlib_complex64_t z = stdlib_complex64( -3.141592653589793f, 3.141592653589793f );
+
+stdlib_complex64_t out = stdlib_base_croundnf( z, -2 );
+
+float re = stdlib_complex64_real( out );
+// returns ~-3.14f
+
+float im = stdlib_complex64_imag( out );
+// returns ~3.14f
+```
+
+The function accepts the following arguments:
+
+-   **z**: `[in] stdlib_complex64_t` input value.
+-   **n**: `[in] int32_t` integer power of 10.
+
+```c
+stdlib_complex64_t stdlib_base_croundnf( const stdlib_complex64_t z, const int32_t n );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/math/base/special/croundnf.h"
+#include "stdlib/complex/float32/ctor.h"
+#include "stdlib/complex/float32/reim.h"
+#include <stdio.h>
+
+int main( void ) {
+    const stdlib_complex64_t x[] = {
+        stdlib_complex64( 3.14f, 1.5f ),
+        stdlib_complex64( -3.14f, -1.5f ),
+        stdlib_complex64( 0.0f, 0.0f ),
+        stdlib_complex64( 0.0f/0.0f, 0.0f/0.0f )
+    };
+
+    stdlib_complex64_t v;
+    stdlib_complex64_t y;
+    float re1;
+    float im1;
+    float re2;
+    float im2;
+    int i;
+    for ( i = 0; i < 4; i++ ) {
+        v = x[ i ];
+        y = stdlib_base_croundnf( v, -2 );
+        stdlib_complex64_reim( v, &re1, &im1 );
+        stdlib_complex64_reim( y, &re2, &im2 );
+        printf( "croundnf(%f + %fi, -2) = %f + %fi\n", re1, im1, re2, im2 );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/math/base/special/croundnf/benchmark/benchmark.js

@@ -0,0 +1,104 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var filledarrayBy = require( '@stdlib/array/filled-by' );
+var floor = require( '@stdlib/math/base/special/floor' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
+var Complex64 = require( '@stdlib/complex/float32/ctor' );
+var realf = require( '@stdlib/complex/float32/real' );
+var imagf = require( '@stdlib/complex/float32/imag' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var croundnf = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var xre;
+	var xim;
+	var n;
+
+	xre = uniform( len, -500.0, 500.0, {
+		'dtype': 'float32'
+	});
+	xim = uniform( len, -500.0, 500.0, {
+		'dtype': 'float32'
+	});
+	n = filledarrayBy( len, 'generic', discreteUniform );
+
+	return benchmark;
+
+	/**
+	* Returns a pseudorandom integer.
+	*
+	* @private
+	* @returns {integer} pseudorandom integer
+	*/
+	function discreteUniform() {
+		return floor( ( randu()*10.0 ) - 5.0 );
+	}
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var z;
+		var y;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			z = new Complex64( xre[ i%len ], xim[ i%len ] );
+			y = croundnf( z, n[ i%len ] );
+			if ( isnanf( realf( y ) ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnanf( realf( y ) ) || isnanf( imagf( y ) ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+bench( pkg, createBenchmark( 10 ) );
+
+bench( format( '%s::len=%d', pkg, 100 ), createBenchmark( 100 ) );