maja222222

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#include <stdio.h>

int error_check(char kod[])
{
    int i;
    int digit_counter = 0;
    int control_number = 0;
    int x = 10;

    for(i=0; i < kod[i]; i++)
    {
        digit_counter++;
    }

    for(i=0; i < kod[i]; i++)
    {
        if(kod[i] == ' ')
        {
            return 1;
        }
    }

    if(digit_counter < 11 || digit_counter>11)
    {
        return 2;
    }


    for(i=0; i < kod[i]; i++)
    {
        if  ((kod[i] >= 'A' && kod[i] <= 'Z') || (kod[i] >= 'a' && kod[i] <= 'z'))
        {
            return 4;
        }
    }

    for(i=0; i < kod[i]; i++)
    {
        if(kod[i] > '9' ||kod[i] < '0')
        {
            return 5;
        }

    }

    control_number = kod[10] - '0';


for (i=0;i<=9;i++) {
    x+=kod[i]-'0';
    if (x%=10);
    else x=10;
    x=x*2%11; }
    x= x==1 ? 0 : 11-x;

    if(x!=control_number)
    {
       return 6;
    }

    return 0;
}

int main()
{
    int i;
    char oib_check[15];

    printf("Unesite OIB: ");
    scanf("%12[^\n]", &oib_check[i]);

    printf("Vraceno = %d ", error_check(oib_check));

    switch(error_check(oib_check))
    {
        case 0:
            printf("\nOIB je ispravan");
            break;

        case 1:
            printf("\nUnesen razmak, neispravan OIB!");
            break;

        case 2:
            printf("\nUnesen krivi broj znamenki znamenki, neispravan OIB!");
            break;

        case 4:
            printf("\nSvi elementi OIB-a nisu znamenke, neispravan OIB!");
            break;

        case 5:
            printf("\nNedozvoljeni znak u OIB-u, neispravan OIB!");
            break;

        case 6:
            printf("\nOIB neispravan, kontrolna znamenka nije dobra!");
            break;
    }

    return 0;
}