#include<stdio.h>
#include<stdlib.h>
#include<string.h>

void za4_1 (int * pole, int const k, int const n) {
    int i;
    for (i = 0; i < n; i++)
    {
        *(pole + i) = (i+1)*k%n;
    }
}

char za4_2(int x) {
    if(x>=0 && x<=35) {
        if(x>=0 && x<=9) {
            return '0'+x;
        } else {
            x -=10;
            return 'a'+x;
        }
    } else {
        return ' ';
    }


}

char * za4_3(int const pole[], int const n) {
    char * retazec;
    int i,x;
    if(n<1)
        return NULL;
    retazec = (char *) malloc(sizeof(char)*n);

    for (i = 0; i < n; i++) {
        x = pole[i];
        if(x>=0 && x<=35) {
            if(x>=0 && x<=9) {
                *(retazec+i) = '0'+x;
            } else {
                x -=10;
                *(retazec+i) = 'a'+x;
            }
        } else {
            *(retazec+i) = ' ';
        }
    }
    return retazec;
}

void vypisPole (int const pole[], int const n) {
    int i;
    printf("{ ");
    for (i = 0; i < n; i++)
    {
        if(i>0)
            printf(", ");
        printf("%d",pole[i]);

    }
    printf("}\n");
}

int za4_4 (char const retazec[]) {
    int i, n, pocet, prevIsNum;

    n = strlen(retazec);
    pocet = 0;
    prevIsNum = 0;

    for (i = 0; i < n; i++)
    {
        if(retazec[i]>='0' && retazec[i]<='9') {
            if(prevIsNum==0) {
                prevIsNum = 1;
                pocet++;
            }
        } else {
            if(prevIsNum==1)
                prevIsNum = 0;
        }
    }
    return pocet;
}



int main() {
    int pole[5];
    char * retazec = NULL;

    za4_1 (pole, 2, 5);
    vypisPole (pole, 5);

    printf("%c\n",za4_2(35));
    retazec = za4_3(pole,5);
    printf("%s\n",retazec);




    // dealokacia dynamickeho pola z funkcie za4_3
    if(retazec!=NULL)
        free((void*)retazec);
    return 0;
}