drugo

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#include <stdio.h>

int error_check(char OIB[])
{
    int i;
    int digit_counter = 0;
    int control_number = 0;
    int x = 10;
    //printf("Testni ispis: %s", OIB);

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

  	//Provjera razmaka
    for(i=0; i < OIB[i]; i++)
    {
        if(OIB[i] == ' ')
        {
            return 1;
        }
    }

	//Provjera duzine
    if(digit_counter < 11)
    {
        return 2;
    }
    else if(digit_counter > 11)
    {
        return 3;
    }

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

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

    }

    control_number = OIB[10] - '0';
    printf("kontrolni broj %d", control_number);

    //Provjera kontrolne znamenke
for (i=0;i<=9;i++) {
	x+=(OIB[i] - '0');
	if (x%=10);
	else x=10;
	x=x*2%11; }
	x= x==1 ? 0 : 11-x;
printf ("\nThe control digit is: %d\n\n", x);

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

    printf("kontroli izracun = %d", x);
    return 0;
}

int main()
{
    int i;
    char OIB[15];
    int error_code = 0;

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

    error_code = error_check(OIB);
    printf("Vraceno = %d ", error_code);

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

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

        case 2:
            printf("\nUneseno premalo znamenki, neispravan OIB!");
            break;

        case 3:
            printf("\nUneseno previse 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;
}