旧的交付时间+ 25％=新的持续时间（军事时间）我一直得到00为我的最终答案帮助！ [英] Old duration of delivery time + 25% = New duration (military time) I keep getting 00 for my final answer help!

问题描述

// File Prologue
// Name: Logan Ballard
// Project: Project 3
// Date: 11/6/14


// I declare that the following source code was written by me, or provided
// by the instructor for this project. I understand that copying
// source code from any other source constitutes cheating, and that I will
// receive a zero grade on this project if I am found in violation of
// this policy.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GGDS
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            //Closes program
            this.Close();
        }

        private void calcNewDurationBtn_Click(object sender, EventArgs e)
        {
            //Where the magic happens
            //Calculate new duration of trip from the given starting and ending time
            const int HUNDRED = 100;
            const double TWENTYFIVEPERC = .25;
            const int MINPERHOUR = 60;
            //CONSTANTS
            int startTime = int.Parse(startingTimeTxtBx.Text);
            int endTime = int.Parse(endingTimeTxtBx.Text);
            //USERGIVEN VARIABLES
            int hours1 = startTime / HUNDRED;
            int minutes1 = startTime % HUNDRED;
            int hours2 = endTime / HUNDRED;
            int minutes2 = endTime % HUNDRED;
            int hoursInMinDuration = (hours2 - hours1) * MINPERHOUR;
            int minDuration = minutes2 - minutes1;
            //************************************************************
            int newHoursInMin = hoursInMinDuration * (int)TWENTYFIVEPERC;
            int newHours = newHoursInMin / MINPERHOUR;
            int newMinutes = minDuration * (int)TWENTYFIVEPERC;
            string strHours = newHours.ToString();
            strHours = Convert.ToString(newHours);
            strHours = string.Format("{0}", newHours);
            strHours = string.Empty + newHours;
            strHours = new StringBuilder().Append(newHours).ToString();

            string strMinutes = newMinutes.ToString();
            strMinutes = Convert.ToString(newMinutes);
            strMinutes = string.Format("{0}", newMinutes);
            strMinutes = string.Empty + newMinutes;
            strMinutes = new StringBuilder().Append(newMinutes).ToString();
            //string strHours = newHours.ToString();
            //string strMinutes = newMinutes.ToString();
            newDurationTxtBx.Text = (strHours + strMinutes);
            //int totalMin = hoursInMin + minutes;
            //************************************************************
            //# of Mario's Clicked
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Logan Ballard\nB7\nProject #3");
        }

        private void startingTimeTxtBx_TextChanged(object sender, EventArgs e)
        {

        }

        private void endingTimeTxtBx_TextChanged(object sender, EventArgs e)
        {

        }

        private void newDurationTxtBx_TextChanged(object sender, EventArgs e)
        {

        }

        private void numMarioClickedTxtBx_TextChanged(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}

推荐答案

int newHoursInMin = hoursInMinDuration * (int)TWENTYFIVEPERC;
int newMinutes = minDuration * (int)TWENTYFIVEPERC;

newHoursInMin和newMinutes将始终为零，

尝试使用

newHoursInMin and newMinutes will be always zero,
try with

int newHoursInMin = (int)(hoursInMinDuration * TWENTYFIVEPERC);
int newMinutes = (int)(minDuration * TWENTYFIVEPERC);

原因是（int）0.25 为零。

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