Programme which stops without errors or warnings before entering the function

Question

Please help! After I run my programme, it does neither breaks, nor any errors or warnings appear and debugger stops in exactly the same moment, before it should approach function - "stworz_inaczej". What's wrong with that? Code below:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <conio.h>

void stworz (int tablica[][6]);
int zablokowany (int tablica[][6], int ind1, int ind2);
int otoczony (int tablica[][6], int ind1, int ind2, int strona);
void stworz_inaczej (int tablica[][6]);
int sprawdz (int tablica[][6]);
void wypisz (int tablica[][6]);

int main()
{
    int wybor;
    int tablica[6][6];

    printf("Ktora metode wybierasz?");
    scanf("%d", &wybor);
    system("cls");
    do{
        if (wybor == 1)
            stworz(tablica);
        if (wybor == 2)
            stworz_inaczej(tablica);
        printf("------------\n\n");
    } while(sprawdz(tablica));
    wypisz(tablica);
    getchar();
    return 0;
}

void stworz (int tablica[][6]){
    int i, j;
    int ind1, ind2, ind3, ind4;
    int kulka = 1;

    for (i = 0; i < 6; ++i)
        for (j = 0; j < 6; ++j)
            tablica[i][j] = 0;
    srand(time(NULL));
    for (i = 0; i < rand() % 18 + 1; ++i){
        do
        {
            ind1 = rand() % 6;
            ind2 = rand() % 6;
            ind3 = rand() % 6;
            ind4 = rand() % 6;
        } while((ind1 == ind3 && ind2 == ind4) || (tablica[ind1][ind2] != 0 || tablica[ind3][ind4] != 0));
        tablica[ind1][ind2] = tablica[ind3][ind4] = kulka;
        kulka++;
    }
}

int sprawdz (int tablica[][6]){
    int i, j;
    int czy_dobrze_1 = 0;

    for (i = 0; i < 6; ++i)
        for (j = 0; j < 6; ++j)
            if(tablica[i][j] != 0){
                if(i - 1 >= 0)
                    if(tablica[i][j] == tablica[i-1][j] || tablica[i-1][j] == 0)
                        czy_dobrze_1 = 1;
                if(czy_dobrze_1 == 0 && j + 1 < 6)
                    if(tablica[i][j] == tablica[i][j+1] || tablica[i][j+1] == 0)
                        czy_dobrze_1 = 1;
                if(czy_dobrze_1 == 0 && i + 1 < 6)
                    if(tablica[i][j] == tablica[i+1][j] || tablica[i+1][j] == 0)
                        czy_dobrze_1 = 1;
                if(czy_dobrze_1 == 0 && j - 1 >= 0)
                    if(tablica[i][j] == tablica[i][j-1] || tablica[i][j-1] == 0)
                        czy_dobrze_1 = 1;
            }

    if (czy_dobrze_1 == 1)
        return 0;
    else
        return 1;
}

int zablokowany (int tablica[][6], int ind1, int ind2){
    int czy_wejsc = 1;

    if (ind1 - 1 >= 0)
        if (tablica[ind1 - 1][ind2] == 0)
            czy_wejsc = 0;
    if (ind1 + 1 < 6)
        if (tablica[ind1 + 1][ind2] == 0)
            czy_wejsc = 0;
    if (ind2 - 1 >= 0)
        if (tablica[ind1][ind2 - 1] == 0)
            czy_wejsc = 0;
    if (ind2 + 1 < 6)
        if (tablica[ind1][ind2 + 1] == 0)
            czy_wejsc = 0;

    if (czy_wejsc == 0)
        return 0;
    else if (czy_wejsc == 1)
        return 1;
}

int otoczony (int tablica[][6], int ind1, int ind2, int strona){
    int czy_wejsc = 1;

    if (ind1 - 1 >= 0 && strona != 3)
        if (tablica[ind1 - 1][ind2] == 0)
            czy_wejsc = 0;
    if (ind1 + 1 < 6 && strona != 1)
        if (tablica[ind1 + 1][ind2] == 0)
            czy_wejsc = 0;
    if (ind2 - 1 >= 0 && strona != 2)
        if (tablica[ind1][ind2 - 1] == 0)
            czy_wejsc = 0;
    if (ind2 + 1 < 6 && strona != 4)
        if (tablica[ind1][ind2 + 1] == 0)
            czy_wejsc = 0;

    if (czy_wejsc == 0)
        return 0;
    else if (czy_wejsc == 1)
        return 1;
}

void stworz_inaczej (int tablica[][6]){
    int i, j, ile_pol = 0, kulka = 0, gdzie, juz = 0, nastepny, koniec;

    for(i = 0; i < 6; ++i)
        for(j = 0; j < 6; ++j)
            tablica[i][j] = 0;

     do{
         koniec = 1;
         kulka ++;
         do{
             i = rand() % 6;
             j = rand() % 6;
         } while(tablica[i][j] != 0 || (zablokowany(tablica, i, j) == 1));
         tablica[i][j] = kulka;
         ile_pol++;
         do{
             nastepny = rand() % 2;
             if(tablica[i-1][j] == 0 && otoczony(tablica, i-1, j, 1) == 1){
                 tablica[i-1][j] = kulka;
                 i--;
                 ile_pol++;
                 nastepny = 0;
                 }
             else if(tablica[i][j+1] == 0 && otoczony(tablica, i, j+1, 2) == 1){
                 tablica[i][j+1] = kulka;
                 j++;
                 ile_pol++;
                 nastepny = 0;
                 }
             else if(tablica[i+1][j] == 0 && otoczony(tablica, i+1, j, 3) == 1){
                 tablica[i+1][j] = kulka;
                 i++;
                 ile_pol++;
                 nastepny = 0;
             }
             else if(tablica[i][j-1] == 0 && otoczony(tablica, i, j-1, 4) == 1){
                 tablica[i][j-1] = kulka;
                 j--;
                 ile_pol++;
                 nastepny = 0;
                 }
             else{
                 do{
                     gdzie = rand() % 4 + 1;
                     switch(gdzie)
                     {
                         case 1:
                             if(i-1 < 0 || tablica[i-1][j] != 0)
                                 break;
                             else {
                                 tablica[i-1][j] = kulka + 20;
                                 i--;
                                 ile_pol++;
                                 juz = 1;
                                 break;
                             }
                         case 2:
                             if(j+1 > 5 || tablica[i][j+1] != 0)
                                 break;
                             else {
                                 tablica[i][j+1] = kulka + 20;
                                 j++;
                                 ile_pol++;
                                 juz = 1;
                                 break;
                             }
                         case 3:
                             if(i+1 > 5 || tablica[i+1][j] != 0)
                                 break;
                             else {
                                 tablica[i+1][j] = kulka + 20;
                                 i++;
                                 ile_pol++;
                                 juz = 1;
                                 break;
                             }
                         case 4:
                             if(j-1 < 0 || tablica[i][j-1] != 0)
                                 break;
                             else {
                                 tablica[i][j-1] = kulka + 20;
                                 j--;
                                 ile_pol++;
                                 juz = 1;
                                 break;
                             }
                     }
                 } while(juz == 0);
                 nastepny = rand() % 2;
             }
         } while (nastepny == 1);
         tablica[i][j] = kulka;
         for (i = 0; i < 6; ++i)
             for (j = 0; j < 6; ++j)
                 if (zablokowany(tablica, i, j) == 0)
                     koniec = 0;
     } while(ile_pol <= 36 && koniec == 0);
     for (i = 0; i < 6; ++i)
         for (j = 0; j < 6; ++j)
             if (tablica[i][j] >= 20)
                 tablica[i][j] = 0;
}

void wypisz (int tablica[][6]){
    int i, j;

    for (i = 0; i<6; ++i){
        printf("\n");
        for (j = 0; j<6; ++j)
            printf("%d\t", tablica[i][j]);
    }
}

Answer 1

You've created an infinite loop, that's why you didn't see anything on the screen. The error was at the outer do ... while clause in stworz_inaczej function.

Just replace this one:

while(ile_pol <= 36 && koniec == 0);

with this one - then the code should work

while(ile_pol <= 36 && koniec != 0);