chore: move number generation to function

Co-authored-by: Athan <[email protected]>
Signed-off-by: Philipp Burckhardt <[email protected]>

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/arcsine/cdf/README.md

@@ -205,6 +205,11 @@ double stdlib_base_dists_arcsine_cdf( const double x, const double a, const doub
 #include <stdlib.h>
 #include <stdio.h>
 
+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 ) {
     double x;
     double a;
@@ -213,9 +218,9 @@ int main( void ) {
     int i;
     
     for ( i = 0; i < 25; i++ ) {
-        x = ( (double)rand() / (double)RAND_MAX ) * 20.0 - 10.0;
-        a = ( (double)rand() / (double)RAND_MAX ) * 20.0 - 20.0;
-        b = a + ( (double)rand() / (double)RAND_MAX ) * 40.0;
+        x = random_uniform( -10.0, 10.0 );
+        a = random_uniform( -20.0, 0.0 );
+        b = random_uniform( a, a+40.0 );
         y = stdlib_base_dists_arcsine_cdf( x, a, b );
         printf( "x: %lf, a: %lf, b: %lf, F(x;a,b): %lf\n", x, a, b, y );
     }