#include <stdio.h>

int number[100]={36, 81, 45, 17, 69, 3, 23, 92, 70, 54};
int count = 10, choice;

void display_array()
{
	int i;

	printf("\nNumber sequence: ");
	for (i=0; i<count; i++)
		printf("%d, ", number[i]);
	printf("\n\n");
}

int show_menu()
{
	printf("1. Insert number\n");
	printf("2. Delete number\n");
	printf("3. Update number\n\n");
	do {
		printf("Option = ");
		scanf("%d", &choice);
	} while (choice<1 || choice>3);
	printf("\n");
}

void update_number()
{
	int index, value;

	if (count > 0)
	{
		do {
			printf("Array index = ");
			scanf("%d", &index);
		} while (index<0 || index>=count);

		printf("Reset value = ");
		scanf("%d", &value);

		number[index] = value;
	}
}

void delete_number()
{
	int index, i;

	if (count > 0)
	{
		do {
			printf("Array index = ");
			scanf("%d", &index);
		} while (index<0 || index>=count);

		for (i=index; i<=count-2; i++)
			number[i] = number[i+1];

		count = count - 1;
	}
}

void insert_number()
{
	int value, index, i;

	if (count == 0)
	{
		printf("New element = ");
		scanf("%d", &value);

		number[0] = value;
		count = count + 1;
	}
	else if (count < 100)
	{
		do {
			printf("Array index = ");
			scanf("%d", &index);
		} while (index<0 || index>=count);

		printf("New element = ");
		scanf("%d", &value);

		for (i=count-1; i>=index; i--)
			number[i+1] = number[i];

		number[index] = value;

		count = count + 1;
	}
}

int main()
{
	while (1)
	{
		display_array();
		show_menu();
		switch (choice)
		{
			case 1:
				insert_number();
				break;
			case 2:
				delete_number();
				break;
			case 3:
				update_number();
				break;
		}
	}

	return 0;
}