selection.txt

#include <iostream>

using namespace std;

#define KEEP_ELITE true

	int resultIndex = 0;
	int firstIndex = 0;
	int secondIndex = 0;
	int bestIndex = 0;
	int worstIndex = 0;

    int fitness[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

    unsigned long counters[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

	void selectRandom() {
		do {
			resultIndex = rand() % 10;
			firstIndex = rand() % 10;
			secondIndex = rand() % 10;
		} while(resultIndex==firstIndex || resultIndex==secondIndex || (resultIndex == bestIndex && KEEP_ELITE==true));
	}

	void selection() {
		static const int CROSSOVER_RESULT_INTO_BEST_PERCENT = 1;
		static const int CROSSOVER_RESULT_INTO_MIDDLE_PERCENT = 9;
		static const int CROSSOVER_RESULT_INTO_WORST_PERCENT = 90;

		static int percent = -1;
		percent = rand()
				  % (CROSSOVER_RESULT_INTO_WORST_PERCENT
					 + CROSSOVER_RESULT_INTO_MIDDLE_PERCENT
					 + CROSSOVER_RESULT_INTO_BEST_PERCENT);

		if (percent < CROSSOVER_RESULT_INTO_WORST_PERCENT) {
			do {
				selectRandom();
			} while (fitness[resultIndex] < fitness[firstIndex]
					 || fitness[resultIndex] < fitness[secondIndex]);
		} else if (percent
				   < (CROSSOVER_RESULT_INTO_WORST_PERCENT
					  + CROSSOVER_RESULT_INTO_MIDDLE_PERCENT)) {
			do {
				selectRandom();
			} while (fitness[resultIndex] < fitness[firstIndex]
					 || fitness[resultIndex] > fitness[secondIndex]);
		} else if (percent
				   < (CROSSOVER_RESULT_INTO_WORST_PERCENT
					  + CROSSOVER_RESULT_INTO_MIDDLE_PERCENT
					  + CROSSOVER_RESULT_INTO_BEST_PERCENT)) {
			do {
				selectRandom();
			} while (fitness[resultIndex] > fitness[firstIndex]
					 || fitness[resultIndex] > fitness[secondIndex]);
		}
	}

int main() {
    unsigned long E = 10000000;
    for(unsigned long e=0; e<E; e++){
        selection();
        counters[resultIndex]++;
    }

    for(int i=0; i<10; i++){
        cout << counters[i] << "\t" << 100*counters[i]/E << endl;
    }

	return 0;
}