我正在参加C 在线类(可能是一个错误(，我正在尝试弄清楚如何更正此代码。我不得不从头开始编写一个程序，我对自己做的不正确感到非常困惑。
这是应该出来的：
BlockQuote欢迎来到名字的地毯计算器！
输入地毯的房间名称：卧室
以英尺的形式输入房间的长度：10
以英尺的形式输入房间的宽度：10
输入每码地毯的价格：3.49
输入填充费用：35
Carpet estimate for bedroom
房间的总平方英尺：100
房间的总正码：12
需要地毯的总成本：41.88
总人工成本($ 6.03/yd(：72.36
填充费用：35.00
小计：149.24
税：8.50
总计：157.74
blockquote
其他一些规则是：房间的平方码是通过将总平方英尺除以9的。为任何分数差异加1码。安装地毯的人工成本为$ 6.03/码税率目前为5.7％
这是我当前的代码：
// John Mayer Learning Unit 2 Assessment
#include <iostream>
using namespace std;
int main()
{
string roomName; // declarations
int roomLength;
int roomWidth;
int squareFeet;
int carpetPrice;
int paddingCost;
int totalCarpetCost;
const int TAX_RATE = .057;
int laborCost;
const int LABOR_RATE = 6.03;
int squareYard;
int subtotal;
int taxCost;
int totalCost;
cout << "Welcome to John Mayer's Carpet Calculator!"; // displays this at the top
cout << "nn What is the name of the room to be carpeted?"; // asks for the room name
cin >> roomName; // stores the room name
cout << "n What is the length of the room (in feet)?"; // asks for the length
cin >> roomLength; // stores the length
cout << "n What is the width of the room (in feet)?"; // asks for the width
cin >> roomWidth; // stores the width
cout << "n What is the price of the carpet per yard?"; // asks for the price of the carpet
cin >> carpetPrice; // stores the price
cout << "n What is the padding cost?"; // asks for the padding cost
cin >> paddingCost; // stores the padding cost **DOES NOT WORK**
squareFeet = roomLength * roomWidth; // finds square feet by multiplying length and width
squareYard = (squareFeet / 9) + 1; // finds the square feet and rounds up to the next yard
totalCarpetCost = carpetPrice * squareYard; // finds the carpet cost by multiplying the input carpet price by the square yardage
laborCost = squareYard * LABOR_RATE; // finds the labor cost by multiplying the yardage by the labor rate of 6.03
subtotal = (totalCarpetCost + paddingCost + laborCost); // finds the subtotal by adding the labor cost, carpet cost, and padding cost
taxCost = subtotal * TAX_RATE; // finds the tax cost by multiplying the subtotal by the tax rate of .057 (5.7%)
totalCost = taxCost + subtotal; // adds the subtotal and tax to find the total overall cost
cout << "n Carpet estimate for " << roomName; // displays text and the room name
cout << "n Total square feet of the room: " << squareFeet; //displays the square feet calculation **CORRECT
cout << "n Total square yards of the room: " << squareYard; // displays the square yards calculation **CORRECT
cout << "nn Total cost of the carpet needed: " << totalCarpetCost; // displays the carpet cost **INCORRECT
cout << "n Total cost of labor (at $6.03/yd): " << laborCost; // displays the labor cost
cout << "n Padding Cost: " << paddingCost; // displays the padding cost
cout << "nn Subtotal: " << subtotal; // displays the subtotal
cout << "n Tax: " << taxCost; // displays the tax calculation
cout << "n Total: " << totalCost; // displays the final total cost
cout << "n"; // line break
system("PAUSE");
return 0;
}
如果您使用的是小数点，则需要使用double而不是int。double是浮点类型。int(整数(是一个整数，而不是分数的数字。因此，使用int进行小数无法正常工作
int a = 1.22;
cout << a << endl;
//this will display 1
double b = 1.22;
cout << b << endl;
//this will display 1.22
因为您的编译器将在十进制的前面使用整个数字，而不是在其之后使用任何内容。
我弄清楚了，唯一的问题是税收是由一分钱减少的。我不知道为什么，但是足够接近。
最终代码：
// John Mayer Learning Unit 2 Assessment
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
string roomName; // declarations
double roomLength;
double roomWidth;
double squareFeet;
double carpetPrice;
double paddingCost;
double totalCarpetCost;
const double TAX_RATE = .057;
double laborCost;
const double LABOR_RATE = 6.03;
int squareYard;
double subtotal;
double taxCost;
double totalCost;
cout << setw(15)<<""<< "Welcome to John Mayer's Carpet Calculator!"; // displays this at the top
cout << "nn What is the name of the room to be carpeted? "; // asks for the room name
cin >> roomName; // stores the room name
cout << "n What is the length of the room (in feet)? "; // asks for the length
cin >> roomLength; // stores the length
cout << "n What is the width of the room (in feet)? "; // asks for the width
cin >> roomWidth; // stores the width
cout << "n What is the price of the carpet per yard? "; // asks for the price of the carpet
cin >> carpetPrice; // stores the price
cout << "n What is the padding cost? "; // asks for the padding cost
cin >> paddingCost; // stores the padding cost (this didn't originally work because carpetPrice was int, not double
squareFeet = roomLength * roomWidth; // finds square feet by multiplying length and width
//squareYard = (squareFeet / 9) + 1; // (Original code before realizing a 3x3 room would not work correctly
squareYard = squareFeet / 9; // finds square yardage
if ((int)squareFeet % 9 != 0) // if the remainder does not equal 0 after dividing by nine, then...
{squareYard++;} // ...round up 1
totalCarpetCost = carpetPrice * squareYard; // finds the carpet cost by multiplying the input carpet price by the square yardage
laborCost = squareYard * LABOR_RATE; // finds the labor cost by multiplying the yardage by the labor rate of 6.03
subtotal = (totalCarpetCost + paddingCost + laborCost); // finds the subtotal by adding the labor cost, carpet cost, and padding cost
taxCost = subtotal * TAX_RATE; // finds the tax cost by multiplying the subtotal by the tax rate of .057 (5.7%)
totalCost = taxCost + subtotal; // adds the subtotal and tax to find the total overall cost
cout << "nn" << setw(20) << "" << "Carpet estimate for " << roomName; // displays text and the room name
cout << "nn Total square feet of the room: " << squareFeet; //displays the square feet calculation **CORRECT
cout << "nn Total square yards of the room: " << squareYard; // displays the square yards calculation **CORRECT
cout << "nnn Total cost of the carpet needed: " << totalCarpetCost; // displays the carpet cost **INCORRECT
cout << "nn Total cost of labor (at $6.03/yd): " << laborCost; // displays the labor cost
cout << std::fixed << std::setprecision(2) << "nn Padding Cost: " << paddingCost; // displays the padding cost
cout << std::fixed << std::setprecision(2) << "nnn Subtotal: " << subtotal; // displays the subtotal
cout << std::fixed << std::setprecision(2) << "nn Tax: " << taxCost; // displays the tax calculation
cout << std::fixed << std::setprecision(2) << "nn Total: " << totalCost; // displays the final total cost
cout << "nn"; // line break
system("PAUSE");
return 0;
}