refactor: modify C implementation to accept double values

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Author: gunjjoshi

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

@@ -172,17 +172,17 @@ logEachMap( '%d choose %d = %d', n, k, binomcoef );
 Evaluates the [binomial coefficient][binomial-coefficient] of two integers `n` and `k`.
 
 ```c
-double v = stdlib_base_binomcoef( 8, 2 );
+double v = stdlib_base_binomcoef( 8.0, 2.0 );
 // returns 28.0
 ```
 
 The function accepts the following arguments:
 
--   **n**: `[in] int64_t` input value.
--   **k**: `[in] int64_t` input value.
+-   **n**: `[in] double` input value.
+-   **k**: `[in] double` input value.
 
 ```c
-double stdlib_base_binomcoef( const int64_t n, const int64_t k );
+double stdlib_base_binomcoef( const double n, const double k );
 ```
 
 </section>
@@ -206,18 +206,16 @@ double stdlib_base_binomcoef( const int64_t n, const int64_t k );
 ```c
 #include "stdlib/math/base/special/binomcoef.h"
 #include <stdio.h>
-#include <stdint.h>
-#include <inttypes.h>
 
 int main( void ) {
-    const int64_t a[] = { 24, 32, 48, 116, 33 };
-    const int64_t b[] = { 12, 6, 15, 52, 22 };
+    const double a[] = { 24.0, 32.0, 48.0, 116.0, 33.0 };
+    const double b[] = { 12.0, 6.0, 15.0, 52.0, 22.0 };
 
     double out;
     int i;
     for ( i = 0; i < 5; i++ ) {
         out = stdlib_base_binomcoef( a[ i ], b[ i ] );
-        printf( "binomcoef(%" PRId64 ", %" PRId64 ") = %lf\n", a[ i ], b[ i ], out );
+        printf( "binomcoef(%lf, %lf) = %lf\n", a[ i ], b[ i ], out );
     }
 }
 ```

lib/node_modules/@stdlib/math/base/special/binomcoef/benchmark/c/native/benchmark.c

@@ -90,16 +90,16 @@ static double rand_double( void ) {
 * @return elapsed time in seconds
 */
 static double benchmark( void ) {
-	int64_t n[ 100 ];
-	int64_t k[ 100 ];
+	double n[ 100 ];
+	double k[ 100 ];
 	double elapsed;
 	double y;
 	double t;
 	int i;
 
 	for ( i = 0; i < 100; i++ ) {
-		n[ i ] = (int64_t)round( 500.0 * rand_double() );
-		k[ i ] = (int64_t)round( 500.0 * rand_double() );
+		n[ i ] = round( 500.0 * rand_double() );
+		k[ i ] = round( 500.0 * rand_double() );
 	}
 
 	t = tic();

lib/node_modules/@stdlib/math/base/special/binomcoef/examples/c/example.c

@@ -18,17 +18,15 @@
 
 #include "stdlib/math/base/special/binomcoef.h"
 #include <stdio.h>
-#include <stdint.h>
-#include <inttypes.h>
 
 int main( void ) {
-	const int64_t a[] = { 24, 32, 48, 116, 33 };
-	const int64_t b[] = { 12, 6, 15, 52, 22 };
+	const double a[] = { 24.0, 32.0, 48.0, 116.0, 33.0 };
+	const double b[] = { 12.0, 6.0, 15.0, 52.0, 22.0 };
 
 	double out;
 	int i;
 	for ( i = 0; i < 5; i++ ) {
 		out = stdlib_base_binomcoef( a[ i ], b[ i ] );
-		printf( "binomcoef(%" PRId64 ", %" PRId64 ") = %lf\n", a[ i ], b[ i ], out );
+		printf( "binomcoef(%lf, %lf) = %lf\n", a[ i ], b[ i ], out );
 	}
 }

lib/node_modules/@stdlib/math/base/special/binomcoef/include/stdlib/math/base/special/binomcoef.h

@@ -19,8 +19,6 @@
 #ifndef STDLIB_MATH_BASE_SPECIAL_BINOMCOEF_H
 #define STDLIB_MATH_BASE_SPECIAL_BINOMCOEF_H
 
-#include <stdint.h>
-
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
 */
@@ -31,7 +29,7 @@ extern "C" {
 /**
 * Computes the binomial coefficient of two integers.
 */
-double stdlib_base_binomcoef( const int64_t n, const int64_t k );
+double stdlib_base_binomcoef( const double n, const double k );
 
 #ifdef __cplusplus
 }

lib/node_modules/@stdlib/math/base/special/binomcoef/manifest.json

@@ -42,7 +42,9 @@
         "@stdlib/math/base/special/floor",
         "@stdlib/math/base/special/gcd",
         "@stdlib/constants/float64/pinf",
-        "@stdlib/constants/float64/max-safe-integer"
+        "@stdlib/constants/float64/max-safe-integer",
+        "@stdlib/math/base/assert/is-integer",
+        "@stdlib/math/base/assert/is-odd"
       ]
     },
     {
@@ -61,7 +63,9 @@
         "@stdlib/math/base/special/floor",
         "@stdlib/math/base/special/gcd",
         "@stdlib/constants/float64/pinf",
-        "@stdlib/constants/float64/max-safe-integer"
+        "@stdlib/constants/float64/max-safe-integer",
+        "@stdlib/math/base/assert/is-integer",
+        "@stdlib/math/base/assert/is-odd"
       ]
     },
     {
@@ -80,7 +84,9 @@
         "@stdlib/math/base/special/floor",
         "@stdlib/math/base/special/gcd",
         "@stdlib/constants/float64/pinf",
-        "@stdlib/constants/float64/max-safe-integer"
+        "@stdlib/constants/float64/max-safe-integer",
+        "@stdlib/math/base/assert/is-integer",
+        "@stdlib/math/base/assert/is-odd"
       ]
     }
   ]

lib/node_modules/@stdlib/math/base/special/binomcoef/src/addon.c

@@ -19,4 +19,4 @@
 #include "stdlib/math/base/special/binomcoef.h"
 #include "stdlib/math/base/napi/binary.h"
 
-STDLIB_MATH_BASE_NAPI_MODULE_LL_D( stdlib_base_binomcoef )
+STDLIB_MATH_BASE_NAPI_MODULE_DD_D( stdlib_base_binomcoef )

lib/node_modules/@stdlib/math/base/special/binomcoef/src/main.c

@@ -16,6 +16,8 @@
 * limitations under the License.
 */
 
+#include "stdlib/math/base/assert/is_integer.h"
+#include "stdlib/math/base/assert/is_odd.h"
 #include "stdlib/math/base/special/binomcoef.h"
 #include "stdlib/math/base/special/floor.h"
 #include "stdlib/math/base/special/gcd.h"
@@ -31,28 +33,32 @@
 * @return     function value
 *
 * @example
-* double out = stdlib_base_binomcoef( 8, 2 );
+* double out = stdlib_base_binomcoef( 8.0, 2.0 );
 * // returns 28.0
 */
-double stdlib_base_binomcoef( const int64_t n, const int64_t k ) {
+double stdlib_base_binomcoef( const double n, const double k ) {
 	double res;
 	double sgn;
-	int64_t nc;
-	int64_t kc;
-	int64_t d;
+	double nc;
+	double kc;
+	double d;
 	double b;
 	double c;
 	double g;
 	double s;
 
+	if ( !stdlib_base_is_integer( n ) || !stdlib_base_is_integer( k ) ) {
+		return 0.0 / 0.0; // NaN
+	}
+
 	if ( k < 0 ) {
 		return 0.0;
 	}
 	sgn = 1.0;
 	nc = n;
 	if ( nc < 0 ) {
 		nc = -nc + k - 1;
-		if ( k & 1 ) {
+		if ( stdlib_base_is_odd( k ) ) {
 			sgn *= -1.0;
 		}
 	}
@@ -63,19 +69,19 @@ double stdlib_base_binomcoef( const int64_t n, const int64_t k ) {
 		return sgn;
 	}
 	if ( k == 1 || k == nc - 1 ) {
-		return sgn * (double)nc;
+		return sgn * nc;
 	}
 
 	// Minimize the number of computed terms by leveraging symmetry:
 	kc = k;
 	if ( nc - kc < kc ) {
 		kc = nc - kc;
 	}
-	s = stdlib_base_floor( (double)STDLIB_CONSTANT_FLOAT64_MAX_SAFE_INTEGER / (double)nc );
+	s = stdlib_base_floor( (double)STDLIB_CONSTANT_FLOAT64_MAX_SAFE_INTEGER / nc );
 
 	// Use a standard algorithm for computing the binomial coefficient
 	res = 1.0;
-	for ( d = 1; d <= kc; d++ ) {
+	for ( d = 1.0; d <= kc; d++ ) {
 		// Check for potential overflow...
 		if ( res > s ) {
 			break;