Block Scheme Example #1

int count = 0;
int sum = 0;
int grade, average;

printf("Vuvedi ocenka (-1 za krai): "); scanf("%d", &grade);

while(grade != -1)
{
    if(grade == 0)
    {
        if(count == 0)
        {
            printf("Ne sa vuvedeni validni ocenki");
        } else {
            average = sum/count;
            break;
        }
    } else if(grade >= 2 && grade <= 6) {
        count++;
        sum += grade;
    }

    printf("Vuvedi sledvashta ocenka (-1 za krai): ");
    scanf("%d", &grade);
}