PSUT

////////////Q3
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int get_matching_digit(int n1, int n2);
int main()
{
    srand(time(NULL));
    char repeat;
    int computer_number, player_number, matching_digit;
    do
    {
        computer_number = 100 + rand() % 900;
        printf("Enter your guess : ");
        scanf_s("%d", &player_number);
        matching_digit = get_matching_digit(computer_number, player_number);
        if (matching_digit != -1) {
            printf("You won!\nThe number is %d.\nYour guess is %d.\nAnd the matching digit is : %d.\n", computer_number, player_number, matching_digit);
        }
        else {
            printf("You lost.\n");
        }
        printf("Do you want to guess again ? [Y\\N] : ");
        scanf_s(" %c", &repeat);
    } while (repeat == 'Y');
    return 0;
}

int get_matching_digit(int n1, int n2)
{
    int lu[11]{ 0 };
    while (n1 > 0)
    {
        lu[n1 % 10] = 1;
        n1 /= 10;
    }
    int d;
    while (n2 > 0)
    {
        d = n2 % 10;
        if (lu[d] == 1)
            return d;
        n2 /= 10;
    }
    return -1;
}

///////////////////////////////////////Q4
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int get_hint(int number);
void play(int number, int trail);
int main()
{
    srand(time(NULL));
    int computer_number = 100 + rand() % 900;
    printf("Hint the product of the number digits is %d.\n", get_hint(computer_number));
    play(computer_number, 1);
    //system("pause");
    return 0;
}
void play(int number, int trail)
{
    if (trail > 1) {
        printf("Trail %d.\n", trail);
    }
    printf("Enter your guess : ");
    int player_guess;
    scanf("%d", &player_guess);
    if (player_guess == number) {
        printf("You won!\n");
    }
    else {
        play(number, trail + 1);
    }
}
int get_hint(int number) {
    int hint = 1;
    while (number > 0)
    {
        hint *= number % 10;
        number /= 10;
    }
    return hint;
}


/////////////////////////////////////////////////Q5
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int get_intial_hint(int number);
int matching_digits_count(int number, int guess);
void play(int number, int trail);
int main()
{
    srand(time(NULL));
    int computer_number = 1000 + rand() % 10000;
    printf("Hint, the sum of the number digits is %d.\n", get_intial_hint(computer_number));
    play(computer_number, 1);
    //system("pause");
    return 0;
}
void play(int number, int trail)
{
    printf("Enter your guess : ");
    int player_guess;
    scanf("%d", &player_guess);
    if (player_guess == number) {
        printf("You won!\n");
    }
    else {
        if (trail == 10) {
            printf("You lost.\n");
            return;
        }
        trail++;
        printf("Trail %d.\n", trail);
        printf("Hint, the count of matching digits between your last guess and the number is %d.\n", matching_digits_count(number, player_guess));
        play(number, trail);
    }
}
int get_intial_hint(int number) {
    int hint = 0;
    while (number > 0)
    {
        hint += number % 10;
        number /= 10;
    }
    return hint;
}
int matching_digits_count(int number1, int number2) {
    int lu[11]{ 0 }, ans = 0;

    for (int i = 0; number1 > 0 && i < 11; i++)
    {
        lu[i] = number1 % 10;
        number1 /= 10;
    }
    for (int i = 0; number2 > 0 && i < 11; i++)
    {
        if (lu[i] == number2 % 10)
            ans++;
        number2 /= 10;
    }
    return ans;
}