Roulette wheel selection

roulette_wheel.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
//just a quick method to print the thresholds of each of the "roulette cells"
void print_thresholds(float* random_inputs, int input_len)
{
	float p_acc=0;
	for (int i = 0; i < input_len; ++i)
	{
		printf("I:%2d L: %3f H: %3f\n",i,p_acc, p_acc+random_inputs[i]);
		p_acc+=random_inputs[i];
	}
	printf("-----------\n");
}
//actually does the roulette method
int select_random(float* random_inputs, int input_len)
{
	//find the probability sum
	float p_total = 0;
	for (int i = 0; i < input_len; ++i)
	{
		p_total+=random_inputs[i];
	}
	printf("Total prob: %f\n", p_total);
	float roulette_val = ((float)(rand()%10000)/10000)*p_total;//generate a value in range [0,p_total]
	printf("Roulette_val: %f\n", roulette_val);
	int roulette_index = 0;
	while(roulette_val>=0 && roulette_index<=input_len) //second part shouldn't really be necessary...
	{
		printf("roulette_val: %f | ",roulette_val);
		//subtract the probability rejected
		roulette_val = roulette_val-random_inputs[roulette_index];
		//move on to next value
		roulette_index++;
	}
	//decrement because of the ++ in the while loop
	roulette_index--;
	printf("\nGot index: %d\n",roulette_index);
	printf("----------------\n");
	return roulette_index;
}

int main(int argc, char const *argv[])
{
	//seed the random number generator with the time
	time_t tmr;
	srand(time(&tmr));
	//generate the array of random values
	float r_values[] = {0.4,0.2,0.5,0.6,0.7,0.1};
	print_thresholds(r_values, 6);
	select_random(r_values,6);
	return 0;
}