这是我第一次在这里发帖，所以有点温柔吗？另外，我正在上我的第一个编程课程，虽然我理解我们在课堂上所做的一切，但我在这里阅读的很多东西都在我脑海中。如果你可以请尽量保持你的答案尽可能基本我会很感激。
话虽如此，我正在使用mac上的代码块进行C ++编程。
这是我从代码块
获得的错误Undefined symbols for architecture x86_64:
"totalBill(double, char, double&, double&, double&, double&)", referenced from:
_main in Watkins-wk6-prog1.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Process terminated with status 1 (0 minute(s), 0 second(s))
0 error(s), 0 warning(s) (0 minute(s), 0 second(s))
我还会发布代码，这样你就可以看一下，看看是否有任何亮点。
#include <iostream>
#include <iomanip>
#include <cctype>
using namespace std;
//Global Constants
double const COM_PRICE = 22.91;
double const MID_PRICE = 25.76;
double const FULL_PRICE = 28.87;
double const SUV_PRICE = 98.88;
int const COM_MILES = 20;
int const MID_MILES = 25;
int const FULL_MILES = 30;
string const SUV_MILES = "Unlimited";
double const COM_OVER_MILES = 0.05;
double const MID_OVER_MILES = 0.07;
double const FULL_OVER_MILES = 0.09;
string const SUV_OVER_MILES = "N/A";
int const WEEK = 7;
double const WEEK_RATE = 6.5;
double const TAX = .115;
string const PROMPT1 = "Enter the number of days for the rental";
string const PROMPT2 = "Enter the number of miles driven";
string const PROMPT3 = "Enter the type of car to be rented (C,M,F,S)";
// function prototypes
char carSize(string prompt);
double inputs (string prompt);
double ChargeForCar(char carType, int numDays);
double carPrice (char carType);
double ChargeforMiles(double miles, char carType);
void totalBill(double miles, char carType, double& taxTotal, double& mileCharge, double&
grandTotal, double& carCharge);
string carSize (char carType);
void billOutput(string carTypeName, int numDays, double miles, double carCharge, double
milageCharge, double taxTotal, double grandTotal);
int main()
{
int numDays; // number of days of rental
int weeks ; // number of weeks in rental period
int extraDays; // number of extra days if car rented for more than a week
double mileCharge = 0;
double carCharge = 0;
double taxTotal = 0;
double grandTotal = 0;
char carType;
double miles;
string carTypeName;
cout << "Program to calculate the charge for a rental car." << endl << endl;
carType = carSize(PROMPT3); // calls function to get the type of car from
// the user
numDays = static_cast<int> (inputs(PROMPT1)); // calls function to get number of days in
//the rental period
miles = inputs(PROMPT2); // calls function to get number of mile driven
// during rental period
// calls function to calculate the total rental car bill
totalBill(miles, carType, taxTotal, grandTotal, mileCharge, carCharge);
carTypeName = carSize(carType); // calls function to save car size as string
//calls function to output the bill componenets
billOutput(carTypeName, numDays, miles, carCharge, mileCharge, taxTotal, grandTotal);
return 0;
}
char carSize(string prompt) // function to present car choices and read in user input
{
char carType;
bool valid = false;
cout << "Type of Car" << setw(16) << "Price per day" << setw(15);
cout << "Included Milage" << setw(24) << "Extra charge per mile" << endl;
cout << setw(66) << setfill ('-') << "-" << endl;
cout << setfill(' ') << "C - Compact size" << setw(8) << COM_PRICE;
cout << setw(5) << COM_MILES << setw(5) << COM_OVER_MILES << endl;
cout << "M - Mid-Size" << setw(8) << MID_PRICE;
cout << setw(5) << MID_MILES << setw(5) << MID_OVER_MILES << endl;
cout << "F - Full size" << setw(8) << FULL_PRICE << setw(5) ;
cout << FULL_MILES << setw(5) << FULL_OVER_MILES << endl;
cout << " S - SUV" << setw(8) << SUV_PRICE << setw(5) ;
cout << SUV_MILES << setw(5) << SUV_OVER_MILES << endl;
do
{
cout << prompt ;
cin >> carType;
carType = toupper(carType);
switch(carType)
{
case 'C':
case 'F':
case 'M':
case 'S':
valid = true;
break;
default:
cout << "Invalid entry. Please enter a letter from the list";
break;
}
}
while (valid == false);
return carType;
}
double inputs(string prompt) // general function to read a prompt and output user input
{
double input;
do
{
cout << prompt;
cin >> input;
if (input <= 0)
{
cout << "Invalid input." << endl;
cout << "Please enter a positive, nonzero interger." << endl;
}
}
while (input <= 0);
return input;
}
double ChargeForCar(char carType, int numDays) // function to calculate the charge for the
//rental period
{
double carCharge;
int weeks;
int extraDays;
double carRate;
carRate = carPrice(carType);
if (numDays >= WEEK)
{
weeks = numDays / WEEK;
extraDays = numDays % WEEK;
carCharge = (weeks * WEEK_RATE * carRate) + (extraDays * carRate);
}
else
{
carCharge = carRate * numDays;
}
return carCharge;
}
double carPrice (char carType) // function to determine which price to use for rental car
{
double carRate;
switch (carType)
{
case 'C':
carRate = COM_PRICE;
break;
case 'F':
carRate = FULL_PRICE;
break;
case 'M':
carRate = MID_PRICE;
break;
case 'S':
carRate = SUV_PRICE;
break;
default:
cout << "Unknown car type" << endl;
break;
}
return carRate;
}
double ChargeForMiles(double miles, char carType) // function to calculate the extra milage
//cost
{
double milesCost;
double extraMiles;
switch(carType)
{
case 'C':
if (miles > COM_MILES)
{
extraMiles = miles - COM_MILES;
milesCost = extraMiles * COM_OVER_MILES;
}
else
{
milesCost = 0;
}
break;
case 'F':
if (miles > FULL_MILES)
{
extraMiles = miles - FULL_MILES;
milesCost = extraMiles * FULL_OVER_MILES;
}
else
{
milesCost = 0;
}
break;
case 'M':
if (miles > MID_MILES)
{
extraMiles = miles - MID_MILES;
milesCost = extraMiles * MID_OVER_MILES;
}
else
{
milesCost = 0;
}
break;
}
return milesCost;
}
void totalBill(double miles, double numDays, char carType, double& taxTotal, double& mileCharge,
double& grandTotal, double& carCharge)
// function to calculate the program totals
{
switch(carType)
{
case 'C':
case 'M':
case 'F':
mileCharge = ChargeForMiles(miles, carType);
break;
default:
mileCharge = 0;
break;
}
carCharge = ChargeForCar(carType, numDays); // call to the function to calculate the charge
//for the rental car
taxTotal = (mileCharge + carCharge) * TAX;
grandTotal = mileCharge + carCharge + taxTotal;
}
string carSize(char carType) //function for setting car type name as a string type
{
string typeName;
if (carType == 'C')
{
typeName = "Compact size";
}
else if (carType == 'M')
{
typeName = "Mid size";
}
else if (carType == 'F')
{
typeName = "Full size";
}
else if (carType == 'S')
{
typeName = "SUV size";
}
return typeName;
}
void billOutput(string carTypeName, int numDays, double miles, double carCharge, double
milageCharge, double taxTotal, double grandTotal)
{
cout << "Rent2U Rental Details" << endl << endl;
cout << "Car Size: " << carTypeName << endl;
cout << "Days Rented" << numDays << "days" << endl;
cout << "Miles Driven" << miles << "miles" << endl << endl;
cout << "BILL" << endl;
cout << "Car Charge" << "$" << carCharge << endl;
cout << "Mialge Charge" << "$" << milageCharge << endl;
cout << "Tax" << "$" << taxTotal << endl;
cout << setw(21) << " " << setw(11) << setfill('-') << "-" << endl;
cout << setfill(' ') << "Total Bill" << "$" << grandTotal << endl << endl;
}
答案 0 :(得分：3)
这是因为totalBill的实现与声明有不同的签名（即不同的参数）。一个需要两个双打，然后是一个炭，另一个，一个加倍然后一个炭。他们需要匹配。