问题描述
我正在编写一个初学者程序，该程序需要一个包含10个琐事问答的文本文件，读取该文件，将问题和答案放入数组，然后将这些问题用于琐事游戏。
我是调试新手，但是我尝试使用Vectors重写程序，并且遇到了同样的问题。
这是琐事文件（答案末尾的数字是正确的答案）：
The Gettysburg Address
The US Declaration of Independence
The Magna Carta
The US Bill of Rights
2
(2) Who said "A billion dollars isn't worth what it used to be"?
J. Paul Getty
Bill Gates
Warren Buffet
Henry Ford
1
(3) What number does "giga" stand for?
One thousand
One million
One billion
One trillion
3
(4) What number is 1 followed by 100 zeros?
A quintillion
A googol
A moogle
A septaquintillion
2
(5) Which of the planets is closest in size to our moon?
Mercury
Venus
Mars
Jupiter
1
(6) What do you call a group of geese on the ground?
skein
pack
huddle
gaggle
4
(7) What do you call a group of geese in the air?
skein
pack
huddle
gaggle
1
(8) Talk show host Jerry Springer was the mayor of this city.
Chicago
Indianapolis
Cincinnati
Houston
3
(9) On a standard telephone keypad,the letters T,U,and V are matched to what number?
5
6
7
8
4
(10) Crickets hear through this part of their bodies.
Head
Knees
Ears
Tail
2
这是我当前的程序：
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;
//Question class
class Question{
private:
string triviaQuestion;
string answer1;
string answer2;
string answer3;
string answer4;
int correctAnswer; //1,2,3 or 4
public:
Question();
//mutator functions
void setTriviaQuestion(string);
void setAnswer1(string);
void setAnswer2(string);
void setAnswer3(string);
void setAnswer4(string);
void setCorrectAnswer(int);
//accessor functions
string getTriviaQuestion();
string getAnswer1();
string getAnswer2();
string getAnswer3();
string getAnswer4();
int getCorrectAnswer();
};
//Question class member functions
Question::Question(){
//initialize member variables
correctAnswer = 0;
triviaQuestion = " ";
answer1 = " ";
answer2 = " ";
answer3 = " ";
answer4 = " ";
}
void Question::setTriviaQuestion(string question){
triviaQuestion = question;
}
void Question::setAnswer1(string option) {
answer1 = option;
}
void Question::setAnswer2(string option) {
answer2 = option;
}
void Question::setAnswer3(string option) {
answer3 = option;
}
void Question::setAnswer4(string option) {
answer4 = option;
}
void Question::setCorrectAnswer(int number) {
correctAnswer = number;
}
string Question::getTriviaQuestion(){
return triviaQuestion;
}
string Question::getAnswer1() {
return answer1;
}
string Question::getAnswer2() {
return answer2;
}
string Question::getAnswer3() {
return answer3;
}
string Question::getAnswer4() {
return answer4;
}
int Question::getCorrectAnswer() {
return correctAnswer;
}
//main function
int main() {
//variables
int playerOnescore = 0;
int playerTwoscore = 0;
string holder = " ";
const int ARRAY_SIZE = 10;
Question triviaInfo[ARRAY_SIZE];
//check for a file's existence before opening it
ifstream dataFile;
dataFile.open("trivia.txt");
if (dataFile.fail()){
//The file does not exist
cout << "ERROR: Cannot open trivia File.";
}
else{
//the file already exists
//get the data from the file and put into the Question array
//for each element of the array
int fiveLineCounter = 0;
int arrayCounter = 0;
while (getline(dataFile,holder)){
cout << holder << endl; // test to see what's being entered
if (fiveLineCounter == 0){
triviaInfo[arrayCounter].setTriviaQuestion(holder);
fiveLineCounter++;
}
if (fiveLineCounter == 1){
triviaInfo[arrayCounter].setAnswer1(holder);
fiveLineCounter++;
}
if (fiveLineCounter ==2){
triviaInfo[arrayCounter].setAnswer2(holder);
fiveLineCounter++;
}
if (fiveLineCounter == 3){
triviaInfo[arrayCounter].setAnswer3(holder);
fiveLineCounter++;
}
if (fiveLineCounter == 4){
triviaInfo[arrayCounter].setAnswer4(holder);
fiveLineCounter++;
}
if (fiveLineCounter == 5){
triviaInfo[arrayCounter].setCorrectAnswer(stoi(holder));
arrayCounter++;
fiveLineCounter = 0;
}
}
}
return 0;
}
运行程序时，这是当前输出：
(1) What famous document begins: "When in the course of human events..."?
Process finished with exit code 0
非常感谢您提供任何帮助或指导，以解决此问题。 谢谢！
解决方法
fiveLineCounter从零开始。因此if (fiveLineCounter == 0){检查为真，代码调用setTriviaQuestion(holder)并递增fiveLineCounter；现在是1。
然后下一个检查if (fiveLineCounter == 1){为真，因此代码调用setAnswer1(holder)（在holder中有同一行）并递增fiveLineCounter；现在是2。
然后下一个检查if (fiveLineCounter == 2){为真，...
这一直持续到setCorrectAnswer(stoi(holder))。 stoi(holder)引发异常，因为holder的内容（仍然是文件的第一行）无法解析为整数。