我遇到了段故障11的错误。它将通过printall()命令运行，但似乎在printInvalidEmail命令中失败。
我还可以输入我创建的其他类。我有大约6个不同的类和这些类的头文件。我正在寻找从哪里开始解决此错误。
/*
* roster.cpp
*
* Created on: Jan 9, 2019
* Author: kaylasiemon
*/
#include <string>
#include <iostream>
#include <vector>
#include <sstream>
#include "student.h"
#include "securityStudent.h"
#include "networkStudent.h"
#include "softwareStudent.h"
#include "degree.h"
#include "roster.h"
using namespace std;
roster::roster() {
}
roster::~roster() {
}
void roster::add(string studentID, string firstName, string lastName, string emailAddress, int age, int daysInCourse1, int daysInCourse2, int daysInCourse3, degree d){
int courseDays[] = {daysInCourse1, daysInCourse2, daysInCourse3};
if (d == degree::SECURITY)
classRosterArray[iindex++] = new securityStudent(studentID, firstName, lastName, emailAddress, age, courseDays, d);
if (d == degree::SOFTWARE)
classRosterArray[iindex++] = new softwareStudent(studentID, firstName, lastName, emailAddress, age, courseDays, d);
if (d == degree::NETWORK)
classRosterArray[iindex++] = new networkStudent(studentID, firstName, lastName, emailAddress, age, courseDays, d);
}
void roster::remove(string studentID){
bool removeStudent = false;
for(int i = 0; i < 5; i++){
if (classRosterArray[i] != NULL) {
if(studentID == classRosterArray[i] ->getID()){
classRosterArray[i] = nullptr;
removeStudent = true;
}
}
}
if (removeStudent == false)
cout << "Student ID invalid. No one to remove";
}
void roster::printAll(){
cout << "Roster:" << endl;
for (int i = 1; i < 6; i++)
classRosterArray[i] -> print();
}
void roster::printByDegreeProgram(int degreeProgram){
cout << "Displaying Roster by Degree Type:" << endl;
degree deg1;
if (degreeProgram == 0)
deg1 = degree::SECURITY;
if (degreeProgram == 1)
deg1 = degree::NETWORK;
if (degreeProgram == 2)
deg1 = degree::SOFTWARE;
for (int i = 1; i < 6; i++){
if (deg1 == classRosterArray[i]->getDegreeProgram())
classRosterArray[i] -> print();
}
}
void roster::printDaysInCourse(string studentID){
int average;
for (int i = 1; i < 6; i++){
if (classRosterArray[i] ->getID() == studentID){
average = (classRosterArray[i]->getCourseDays()[0] + classRosterArray[i]->getCourseDays()[1] + classRosterArray[i]->getCourseDays()[2]) / 3;
cout << average << endl;
}
}
}
void roster::printInvalidEmails(){
cout << "invalid email addresses:" << endl;
for (int i = 0; i < 5; i++){
bool atSign = false;
bool space = false;
bool period = false;
string email;
email = classRosterArray[i] ->getemail();
for (char &letter:email){
if (letter == '@')
atSign = true;
if (letter == ' ')
space = true;
if (letter == '.')
period = true;
}
if (atSign == false || space == false || period == false)
cout << classRosterArray[i] ->getemail() << endl;
}
}
int main(){
const string studentData[] ={ "A1,John,Smith,John1989@gm ail.com,20,30,35,40,SECURITY",
"A2,Suzan,Erickson,Erickson_1990@gmailcom,19,50,30,40,NETWORK",
"A3,Jack,Napoli,The_lawyer99yahoo.com,19,20,40,33,SOFTWARE",
"A4,Erin,Black,Erin.black@comcast.net,22,50,58,40,SECURITY",
"A5,Kayla,Siemon,ksiemon@wgu.edu,24,30,33,29,SOFTWARE"};
roster classRoster;
cout << "Scripting and Programming - Applications – C867" << endl << "Kayla Siemon" << endl <<"#000736769" << endl;
degree degreepath;
for (int i = 0; i < 5; i++){
stringstream studentlist(studentData[i]);
vector<string> results;
while(studentlist.good()){
string temp;
getline(studentlist, temp, ',');
results.push_back(temp);
}
if (results[8] == "SECURITY")
degreepath = degree::SECURITY;
if (results[8] == "NETWORK")
degreepath = degree::NETWORK;
if (results[8] == "SOFTWARE")
degreepath = degree::SOFTWARE;
classRoster.add(results[0], results[1], results[2], results[3], stoi(results[4]), stoi(results[5]), stoi(results[6]), stoi(results[7]), degreepath);
}
classRoster.printAll();
classRoster.printInvalidEmails();
classRoster.printDaysInCourse("A1");
classRoster.printByDegreeProgram(SOFTWARE);
classRoster.remove("A3");
classRoster.remove("A3");
return 0;
}
答案 0 :(得分：3)
这是发展调试技能的好机会。您要做的第一件事是准确地 哪一行代码触发了崩溃。您可以使用调试器（通过逐步执行代码）来做到这一点，或者，如果愿意，也可以手动检测代码。例如，如果您认为崩溃是在printInvalidEmail()方法内发生的，则可以通过向该方法临时添加调试输出行，将其范围缩小到特定行，如下所示：
void roster::printInvalidEmails(){
cout << "invalid email addresses:" << endl;
for (int i = 0; i < 5; i++){
cout << "X1 " << i << endl;
bool atSign = false;
bool space = false;
bool period = false;
cout << "X2 " << endl;
string email;
cout << "X3 " << endl;
email = classRosterArray[i] ->getemail();
cout << "X4 " << endl;
for (char &letter:email){
cout << "X5 " << letter << endl;
if (letter == '@')
atSign = true;
if (letter == ' ')
space = true;
if (letter == '.')
period = true;
}
cout << "X6" << endl;
if (atSign == false || space == false || period == false)
{
cout << "X7" << endl;
cout << classRosterArray[i] ->getemail() << endl;
}
cout << "X8" << endl;
}
cout << "X9" << endl;
}
请注意，我插入了很多行，例如cout << "X1" << endl;，每行都打印一个唯一的字符串，因此我可以轻松区分它们。现在，当您运行程序时，将获得更多的输出，但是要看的主要是程序崩溃之前的最后一行文本输出-导致崩溃的代码很可能在崩溃之后输出该文本的行。
找到该行，它将（希望）使您知道该行可能崩溃的原因-例如，如果您看到的文本输出的最后一行是“ X3”，而您没有看到“ X4“之后打印，那么您可以确定行email = classRosterArray[i]->getemail();导致崩溃了……并且可能的原因是classRosterArray[i]是NULL或无效的指针（因此当您尝试取消对它的调用以调用getemail()时发生崩溃–然后，您需要跟踪在classRosterArray中设置条目的各个位置，以弄清为什么它们没有正确设置它。 （或者，也可能是getmail()方法内部有一个错误，并且程序在那里崩溃了–在这种情况下，您可以在该方法内部添加更多的调试输出以弄清位置和原因）< / p>
一旦弄清了导致崩溃的原因，并进行了修复，则可以返回并再次删除所有临时调试输出行。 （请注意，我故意不让所有临时cout调用缩进，这样一来，它们显然会从“真实”代码中突出显示，很容易在调试完成后返回并快速删除它们）