嗨我正在为一所学校的项目工作,不能为我的生活弄清楚如何让totalJobCost函数工作。其他职能的工作没有问题,但我不认为他们是路过的VAR回到主为totalJobCost抢的totalJobCost输出0。这里是我使用的代码:Paint Job Estimator C++
#include "stdafx.h"
#include <iostream>
using namespace std;
void space(double paintarea, double paintcost, double paintneeded, double totalpaint);
void cost(double hrs, double hrcost, double spacetopaint);
void totalJobCost(double allTheirPaintCost, double allTheirWages, double theirTotalJobCost);
const double AREA_FORMULA = 220.00;
const double AREAFORMULA_PAINT = 1.00;
const double AREAFORMULA_HOURS = 8.00;
const double AREAFORMULAHOURS_WAGES = 35.00;
int main()
{
double areaTP;
double paintCST = 0;
double paintNeeded = 0;
double allPaintCost = 0;
double hoursNeeded = 0;
double hoursWages = 0;
double allWages = 0;
double allJobCost = 0;
cout << "Enter the square footage you need to paint, then press enter" << endl;
cin >> areaTP;
cout << "Enter the price by gallons of paint you will use, then press enter" << endl;
cin >> paintCST;
while (paintCST < 10)
{
cout << "Enter the price by gallons of paint you will use, then press enter. cannot be less than 10 :";
cin >> paintCST;
}
space(areaTP, paintCST, paintNeeded, allPaintCost);
cost(hoursNeeded, hoursWages, areaTP);
totalJobCost(allPaintCost, hoursWages, allJobCost);
system("Pause");
return 0;
}
void space(double paintarea, double paintcost, double paintneeded, double totalpaint)
{
paintneeded = paintarea/AREA_FORMULA * AREAFORMULA_PAINT;
totalpaint = paintneeded * paintcost;
cout << "How many gallons of paint you will need: " << paintneeded << endl;
cout << "Your total paint cost will be: " << totalpaint << endl;
}
void cost(double hrs, double hrcost, double spacetopaint)
{
hrs = (spacetopaint/AREA_FORMULA) * AREAFORMULA_HOURS;
hrcost = hrs * AREAFORMULAHOURS_WAGES;
cout << "The number of hours for the job will be: " << hrs << endl;
cout << "The total amount of wages will be: " << hrcost << endl;
}
void totalJobCost(double totalpaint, double hrcost, double theirTotalJobCost)
{
theirTotalJobCost = totalpaint + hrcost;
cout << "The total price of your paint job will be: " << theirTotalJobCost << endl;
}
谢谢你的工作,但可以请你解释双重和作品?它只是说改变这个值无处不在,或者只是改变它运行的函数中的值(即:主) –
它是后者:函数'space()',例如,只会改变'allPaintCost'的值在函数运行在('main()')中。 – frslm
double&只是我下面给出的代码示例的简写,因为它很常见。它增加了一些安全功能,如不允许重新分配指针。 –