Auto generate ID number for array

[Mike_S]

Hello to all

Please I need some help for homework of my daughter

She have a task to create a movie library and the first command is to generate for each records the ID number automatically

She write a code as following

int menu()
{
int choice;


printf("Input:\n");
printf("1. Insert a new movie\n");
printf("2. Delete a movie based on movie's ID .\n");
printf("3. Search a movie based on movie's title.\n");
printf("4. Search a movie based on directo's surname.\n");
printf("5. Display movies.\n");
printf("6. Exit.\n");




scanf("%d", &choice);


return choice;
}


void insert_movie(movies_m *mo)
{
movie_m m;


printf("ID: ");
fflush(stdin);
scanf("%d", &m.id);

printf("Title: ");
fflush(stdin);
scanf("%s", m.title);

printf("Name: ");
fflush(stdin);
scanf("%s", m.name);

printf("Surname: ");
fflush(stdin);
scanf("%s", m.surname);

printf("Day: ");
fflush(stdin);
scanf("%d", &m.day);

while(m.day>31 || m.day<1)
{
    printf("Not valid Day.\nPlease try again (1-31)\n");
    printf("DAY :\n");
    fflush(stdin);
    scanf("%d",&m.day);    
}
    

printf("Month: ");
fflush(stdin);
scanf("%d", &m.month);
while(m.month>12 || m.month<1)
{
    printf("Not valid Month.\nPlease try again (1-12)\n");
    printf("Month :\n");
    fflush(stdin);
    scanf("%d",&m.month);    
}

printf("Year: ");
fflush(stdin);
scanf("%d", &m.year);
while(m.year>2100 || m.year<1)
{
    printf("Not valid Year.\nPlease try again (1-2100)\n");
    printf("Year :\n");
    fflush(stdin);
    scanf("%d",&m.year);    
}

Thank you in advance

Mike

[Salem]

Something like this is simple enough for homework.

int getNextId(void) {
  static int id = 0;
  return id++;
}

Being declared static, the id variable will remember the last value it had between calls to the function.

On another note, remove all those fflush(stdin) calls.