c ++中的函数可以防止以前的代码被执行

Question

我的主要功能中只有很少的代码：

cout << "cout working.\n";
GA genetics;
genetics.run();

当我编译它时，编译器没有任何问题，但是当我运行此代码时，cout working甚至没有显示。奇怪的是，当我拿出genetics.run();时，它会被打印出来。

因为我真的不知道，这个问题甚至来自哪里我会在这里发布我的全部代码，所以也许你们中的一个可以帮助我。

#include <time.h>
#include <stdlib.h>
#include <iostream>

using namespace std;

class GA{
public:
    GA(): POPULATION(30), CARDS(10), TARG_SUM(36), TARG_PROD(360), MAX_TOUR(1000), MUT(10), REC(50){};
    void run();
private:
    const int POPULATION;
    const int CARDS;
    const int TARG_SUM;
    const int TARG_PROD;
    const int MAX_TOUR;
    const int MUT;
    const int REC;
    int gene[30][10];
    void init_pop();
    double evaluate(int n);
    void display(int tournaments, int n);
};

int main() {
    cout << "cout working.\n";

    GA genetics;
    genetics.run();

}

void GA::run(){
    cout << "run called\n";
    int a, b, winner, loser;
    init_pop();
    for(int round = 0; round < MAX_TOUR; round++){
        a = rand()%POPULATION;
        b = rand()%POPULATION;
        while(a == b){
            b = rand()%POPULATION;
            cout < "in loop \n";
        }
        cout << "Testing " << a << " against " << b << endl;
        if(evaluate(a) < evaluate(b)){
            winner = a;
            loser = b;
        } else {
            winner = b;
            loser = a;
        }
        if(evaluate(winner) == 0.0){
            display(round, winner);
        }
        for(int i=0; i<CARDS; i++){
            if(rand()%100 < REC)
                gene[loser][i] = gene[winner][i];
            if(rand()%100 < MUT)
                gene[loser][i] = 1-gene[loser][i]; //invertiert gen

            if(evaluate(loser) == 0.0)
                display(round, loser);
        }
    }
}

void GA::init_pop(){
    cout << "called";
    srand(time(NULL));
    for(int n = 0; n < POPULATION; n++){
        for(int i = 0; i < CARDS; i++){
            i = rand()%2;
        }
    }
}

double GA::evaluate(int n){
    int sum = 0, prod = 1;
    double sum_error, prod_error, combined_error;
    for(int i=0; i<10; i++){
        if(gene[n,i] == 0){
            sum += (1+i);
        } else {
            prod *= (1+i);
        }
    }
    sum_error = (sum-TARG_SUM)/TARG_SUM;
    prod_error = (prod-TARG_PROD)/TARG_PROD;
    combined_error = abs(sum_error)+abs(prod_error);
    return combined_error;
}

void GA::display(int tournaments, int n){
    cout << "\n\n Tournaments: " << tournaments <<"\n Solution sum pile: (should be 36) are:\n";
    for(int i=0; i<CARDS; i++){
        if(gene[n][i] == 1)
            cout << i+1 << endl;
    }
    cout << "The results for the product pile (should be 360) are:\n";
    for(int i=0; i<CARDS; i++){
        if(gene[n][i] == 0)
            cout << i+1 << endl;
    }
}