refactor: update the example.c

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---

Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/hypergeometric/variance/examples/c/example.c

@@ -17,11 +17,13 @@
 */
 
 #include "stdlib/stats/base/dists/hypergeometric/variance.h"
+#include "stdlib/math/base/special/round.h"
 #include <stdlib.h>
 #include <stdio.h>
 
-static int random_integer( const int min, const int max ) {
-    return min + rand() % ( max - min + 1 );
+static double random_uniform( const double min, const double max ) {
+	double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+	return min + ( v*(max-min) );
 }
 
 int main( void ) {
@@ -36,9 +38,9 @@ int main( void ) {
     printf( "-------------------------------------------------" );
 
     for ( i = 0; i < 10; i++ ) {
-        N = random_integer( 10, 100 );
-        K = random_integer( 1, N );
-        n = random_integer( 1, N );
+        N = stdlib_base_round(random_uniform(0.0, 20.0));
+        K = stdlib_base_round(random_uniform(0.0, N));
+        n = stdlib_base_round(random_uniform(0.0, K));
         v = stdlib_base_dists_hypergeometric_variance( N, K, n );
 
         printf( "N: %lf, K: %lf, n: %lf, Variance: %lf\n", N, K, n, v );

lib/node_modules/@stdlib/stats/base/dists/hypergeometric/variance/manifest.json

@@ -72,6 +72,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/assert/is-nonnegative-integer",
+        "@stdlib/math/base/special/round",
         "@stdlib/constants/float64/pinf"
       ]
     }