Excercise 1 and 2

#include < stdio.h >
/*
*
* Excercise #1
void main()
{
    printf("1. Hello Yan\n");

    double PI = 3.141592;

    printf("2. %.2lf\n", PI);

    printf("3.\n  *\n ***\n*****\n");

    printf("4.\nEnter 2 integers:\n");

    int a, b, c;

    scanf_s("%d%d", &a, &b);

    printf("Sum of (%d+%d): %d\n",a,b, (a + b));
    printf("Division of (%d/%d): %.2lf\n", a,b, (double) a / b);
    printf("Modulo of (%d mod %d): %d\n", a, b, a % b);

    printf("5.\nA = %d || B = %d\n", a, b);

    printf("#1: a = %d || b = %d\n", b, a);

    c = a;
    a = b;
    b = c;

    printf("#2: a = %d || b = %d\n", a, b );
}
*/

void main()
{
    /*
    int a;

    printf("Enter a 3 digit number i.e 184\n");

    scanf_s("%d", &a);

    while (a <= 99 || a > 999)
    {
        printf("Enter a 3 digit number i.e 184\n");
        scanf_s("%d", &a);
    }

    int pos[4];

    pos[0] = (a / 100);
    pos[1] = (a % 100) / 10;
    pos[2] = (a % 100) % 10;

    printf("#1.\nThe sum of the number #%d is --> %d\n", a, pos[0] + pos[1] + pos[2]);
    printf("#2.\nThe new number is: %d%d%d\n", pos[2], pos[1], pos[0]);

    pos[3] = pos[0] + (pos[1] * 10) + (pos[2] * 100);
    printf("#2.\nThe new number is: %d\n", pos[3]);

    pos[0] = a / 365;
    pos[1] = (a % 365) / 30;
    pos[2] = (a % 365) % 30;
    printf("#3.\n%d days are %d years and %d months with %d extra days.\n", a, pos[0],pos[1],pos[2]);
    */

    /*
    int gTemp[4];
    int attempt;

    for (attempt = 0; attempt < 4; attempt++)
    {
        if (attempt < 3)
            printf("Please enter the grade you recieved for Task #%d\n", attempt + 1);

        else
            printf("Please enter the grade you recieved for the Test.\n");

            scanf_s("%d", &gTemp[attempt]);

            while (gTemp[attempt] < 0 || gTemp[attempt] > 100)
            {
                printf("Invalid value for the 'grade' please try again.\n");
                scanf_s("%d", &gTemp[attempt]);
            }
    }

    printf("* Test Results:\n");
    printf("[TASK 1]     %d\n", gTemp[0] );
    printf("[TASK 2]     %d\n", gTemp[1] );
    printf("[TASK 3]     %d\n", gTemp[2]);
    printf("* Avg. Task Results: %d\n", (gTemp[0]+gTemp[1]+gTemp[2]) / 3);
    printf("[TEST]       %d\n", gTemp[3]);
    printf("* Test Results: %.0lf\n", (((gTemp[0] + gTemp[1] + gTemp[2]) / 3) * 0.2) + (gTemp[3] * 0.8));
    */

    /*
    int i;
    double x, tempx;

    printf("Enter a value for X:\n");

    scanf_s("%lf", &x);

    tempx = x;

    for (i = 2; i <= 8;)
    {
        tempx *= x;

        printf("[X^%d]:    %.0lf\n", i, tempx);

        tempx *= x;

        i += 2;
    }
    */

    int Distance, CarSpeed, FlySpeed;

    printf("First enter the distance in KM from City A to City B:\n");

    scanf_s("%d", &Distance);

    while (Distance < 1)
    {
        printf("Invalid value for distance, please enter a new value:\n");

        scanf_s("%d", &Distance);
    }

    printf("Now enter the speed of the cars in Km/h:\n");

    scanf_s("%d", &CarSpeed);

    while (CarSpeed < 1)
    {
        printf("Invalid value for speed, please enter a new value:\n");

        scanf_s("%d", &CarSpeed);
    }

    printf("Lastly enter the bonus speed for the fly over the cars in Km/h:\n");

    scanf_s("%d", &FlySpeed);

    while (FlySpeed < 1)
    {
        printf("Invalid value for bonus, please enter a new value:\n");

        scanf_s("%d", &FlySpeed);
    }

    printf("The distance between the cities in kilometers is: %d km\n", Distance);
    printf("The speed of the cars in km/h is: %d km/h\n", CarSpeed);
    printf("The speed of the fly in km/h is: %d km/h\n", CarSpeed + FlySpeed);

    printf("The cars will crash after: %.2lf hour(s)\n", (double) Distance / CarSpeed );
    printf("Over this time the fly will travel a distance of: %.2lf km\n", (FlySpeed + CarSpeed) * ((double)Distance / CarSpeed));
}