Harvest, 2 problems.

At line 27 string interpolation was not correct :

$"Good harvest this year! Total wine: {Math.Floor(wine)} liters."

should have been used instead of

$"Good harvest this year! Total wine: {wine} liters.", Math.Floor(wine)

=> Math.Floor(wine) will not applied on wine

Line 30, validation with if(neededLitersWine > wine), instead of if(neededLitersWine >= wine)

PipesInPool, 2 problems.

Set all the input values to double and don't cast the calculations (int). That way you won't receive percentage numbers. Also, it's easier to use $”” String interpolation for the output text.

Code:

using System;

namespace Harvest
{
    class Program
    {
        static void Main()
        {
            //Input
            double vineyard = double.Parse(Console.ReadLine());
            double grape = double.Parse(Console.ReadLine());
            double neededLitersWine = double.Parse(Console.ReadLine());
            int numberOfWorkers = int.Parse(Console.ReadLine());
            double oneLiter = 2.5;

            //Calculation
            var totalGrape = vineyard * grape;

            var wine = 0.40 * totalGrape / oneLiter;

            if (wine >= neededLitersWine)
            {
                double total = Math.Ceiling(wine - neededLitersWine);
                double left = Math.Ceiling(total / numberOfWorkers);
                Console.WriteLine($"Good harvest this year! Total wine: {Math.Floor(wine)} liters.");
                Console.WriteLine("{0} liters left -> {1} liters per person.", total, left);
            }
            else if (neededLitersWine > wine)
            {
                double moreVine = Math.Floor(neededLitersWine - wine);
                Console.WriteLine($"It will be a tough winter! More {moreVine} liters wine needed.");
            }
        }
    }
}

Code:

using System;

namespace TestConditionalStatements
{
    class Program
    {
        static void Main()
        {
            double volumeOfPool = double.Parse(Console.ReadLine());
            double firstPipe = double.Parse(Console.ReadLine());
            double secondPipe = double.Parse(Console.ReadLine());
            double hour = double.Parse(Console.ReadLine());

            var volumeOfFirstPipe = firstPipe * hour;
            var volumeOfSecondPipe = secondPipe * hour;
            var total = volumeOfFirstPipe + volumeOfSecondPipe;

            if (total <= volumeOfPool)
            {
                var full = (total / volumeOfPool) * 100;
                var firstPipeContribution = (volumeOfFirstPipe / total) * 100;
                var secondPipeContribution = (volumeOfSecondPipe / total) * 100;

                //Console.WriteLine($"The pool is {0:f2} % full.Pipe 1: {1:f2}%).Pipe 2: {2:f2}%.", full, firstPipeContribution, secondPipeContribution);
                Console.WriteLine($"The pool is {full:f2} % full. Pipe 1: {firstPipeContribution:f2}%. Pipe 2: {secondPipeContribution:f2}%.");
            }
            else
            {
                var pfull = total - volumeOfPool;
                //Console.WriteLine($"For {0} hours the pool overflows with {1:f2} liters.", hour, pfull);
                Console.WriteLine($"For {hour} hours the pool overflows with {pfull:f2} liters.");
            }
        }
    }
}