所以我一直在为一个项目上课,一切都在游泳,直到我不得不按姓氏按升序排序信息。进一步详细说明,在我的程序中,我应该接受文件输入,将其应用于我认为合适的任何类型的变量,通过将它们的答案与答案键进行比较来计算其成绩,然后按姓氏对条目进行排序。没有进一步的麻烦这里是我的代码! (温柔)
#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <algorithm>
const int TEST_SIZE = 10;
using namespace std;
struct StudentInfo
{
int id;
string fName;
string lName;
char testAnswers[10];
int totalPoints = 0;
int avg = 0;
char letterGrade;
};
void inputInfo(char[], StudentInfo[]);
void calcGrade(char[], StudentInfo[]);
void bubbleSort(StudentInfo[]);
void outputInfo(StudentInfo[]);
int main()
{
StudentInfo studentInfo[10];
string temp;
char answerKey[10];
inputInfo(answerKey, studentInfo);
calcGrade(answerKey, studentInfo);
bubbleSort(studentInfo);
outputInfo(studentInfo);
return 0;
}
void inputInfo(char answerKey[], StudentInfo studentInfo[])
{
cout << "Please enter the 10-question answer key: \n";
for(int i = 0; i < TEST_SIZE; i++)
{
cout << "Question " << i+1 << "\n";
cin >> answerKey[i];
}
ifstream inFile("student.txt");
for(int i = 0; i < TEST_SIZE; i++)
{
inFile >> studentInfo[i].id;
inFile >> studentInfo[i].fName;
inFile >> studentInfo[i].lName;
for(int j = 0; j < TEST_SIZE; j++){
inFile >> studentInfo[i].testAnswers[j];
}
}
}
void calcGrade(char answerKey[], StudentInfo studentInfo[])
{
for(int i = 0; i < TEST_SIZE; i++)
{
for(int j = 0; j < TEST_SIZE; j++)
{
if(studentInfo[i].testAnswers[j] == answerKey[j])
{
studentInfo[i].totalPoints += 5;
}
studentInfo[i].avg = studentInfo[i].totalPoints * 2;
if(studentInfo[i].avg >= 90)
{
studentInfo[i].letterGrade = 'A';
}
else if(studentInfo[i].avg >= 80)
{
studentInfo[i].letterGrade = 'B';
}
else if(studentInfo[i].avg >= 70)
{
studentInfo[i].letterGrade = 'C';
}
else if(studentInfo[i].avg >= 60)
{
studentInfo[i].letterGrade = 'D';
}
else
{
studentInfo[i].letterGrade = 'F';
}
}
}
}
void bubbleSort(StudentInfo studentInfo[])
{
StudentInfo temp;
int i;
int j;
for(i = 0; i < (TEST_SIZE-1); i++)
{
for(j = 0; j < TEST_SIZE; j++)
{
if(studentInfo[j].lName < studentInfo[j-1].lName)
{
temp = studentInfo[j];
studentInfo[j] = studentInfo[j-1];
studentInfo[j-1] = temp;
}
}
}
}
void outputInfo(StudentInfo studentInfo[])
{
cout << setprecision(1) << fixed;
cout << "Student ID\tStudent Name\tAnswers\tTotal Pts\tAverage\t Letter Grade" << endl;
for(int i = 0; i < TEST_SIZE; i++)
{
cout << studentInfo[i].id << "\t";
cout << studentInfo[i].lName << " ";
cout << studentInfo[i].fName << "\t";
for(int j = 0; j < TEST_SIZE; j++)
{
cout << studentInfo[i].testAnswers[j];
}
cout << "\t" << studentInfo[i].totalPoints << "\t";
cout << studentInfo[i].avg << "\t";
cout << studentInfo[i].letterGrade << "\n";
}
}
我在微薄的能力范围内尝试了一切,但我的程序总是崩溃。假设在冒泡排序期间,因为没有该部分它可以正常工作。如果有人可以告诉我我的错误,我会非常感激。很抱歉给您造成的任何不便。
答案 0 :(得分:2)
这里发生了什么
temp = studentInfo[j];
studentInfo[j] = studentInfo[j-1];
studentInfo[j-1] = temp;
j==0
时?您访问越界。您最好使用<algorithm>
中的std::swap
std::swap(studentInfo[j], studentInfo[j+1]);
确保在j
之前运行TEST_SIZE - 1
。或者写下&#34;手册&#34;交换,但由j
交换j+1
。