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#include <stdio.h>
#include <stdlib.h>
#define A 16807.0
#define M 2147483647.0
/*
* This function calls floor() which does not have a prototype.
* Test that the argument to floor is passed correctly.
*/
double
my_rand(double seed)
{
double t = A*seed + 1;
double floor();
seed = t - (M * floor(t / M)); /* t%M if t > M; t otherwise */
return seed;
} /* end of random */
int
main(int argc, char** argv)
{
double seed = 123 * ((argc > 1)? atof(argv[1]) : 3.1415926);
printf("my_rand(%lf) = %lf\n", seed, my_rand(seed));
return 0;
}
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