#include
#include
#include
using namespace std;
const int Max_No_Record=100; //maximum number of records in the file record.txt
const int Max_Len_ID=7; //each ID contains 6 characters
const int Max_Len_grades=11; //ten grades at most and they are separated by a space
const char file_name[20]="record.txt";
void read_record(ifstream &in,char ID[Max_No_Record][Max_Len_ID], char grade[Max_No_Record][Max_Len_grades],int no_records);
void sort_by_ID(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no);
void sort_by_grades(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no);
void print(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no);
int main() {
char ID[Max_No_Record][Max_Len_ID],grades[Max_No_Record][Max_Len_grades];
int no_records=0; //total number of records in the file
int option;
ifstream fin; //create input file stream
ofstream fout; //create output file stream
fin.open(file_name); //associate a file to the input file stream
read_record(fin, ID, grades, no_records); //read records into arrays
do {
do {
cout << "Please choose an option:" << endl
<< "1.sort by ID 2.sort by grades 3.exit: ";
cin >> option;
}while (option!=1 && option!=2 && option!=3);
if (option==1) {
sort_by_ID(ID, grades, no_records);
}else if (option==2) {
sort_by_grades(ID, grades, no_records);
}else if (option==3) {
return 0;
}
print(ID, grades, no_records); //print all the records
}while(option!=3);
return 1;
}
/*
Purpose: Read student records from a file "record.txt" into arrays. Each record consists of a student ID
and a list of CE grades separated by a space.
Parameter: Input file stream, 2-D Array for storing ID, 2-D Array for storing grades, total number of records (pass by ref)
Output: a list of record, number of records
*/
void read_record(ifstream &in,char ID[Max_No_Record][Max_Len_ID], char grade[Max_No_Record][Max_Len_grades],int no_records){
int check=0;
for (int Max_No_Record=0;Max_No_Record<=100;Max_No_Record++){
for (int Max_Len_ID=0;Max_Len_ID<=5;Max_Len_ID++){
in.get(ID[Max_No_Record][Max_Len_ID]);
if (ID[Max_No_Record][Max_Len_ID]=='\t')break;
}
for (int Max_Len_grades=0;Max_Len_grades<=10;Max_Len_grades++){
in.get(grade[Max_No_Record][Max_Len_grades]);
if (grade[Max_No_Record][Max_Len_grades] == '\n')break;
if (in.eof()){
break;
}
}
if (in.eof()){
break;
}
}
}
/*
Purpose: Sorting the records by ID.
Parameter: ID, grades, total number of records
Output: Sorted list of records
*/
void sort_by_ID(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no_records) {
char line[Max_No_Record][7];
int row;
for (row=0;row<=Max_No_Record;row++)
strcpy(line[row],ID[row]);
for (row=0;row<=100;row++)
for (int col=0;col<=7;)cout << line[row];
}
/*
Purpose: Sorting the records by grades.
Parameter: ID, grades, total number of records
Output: Sorted list of records
*/
void sort_by_grades(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no_records) {
}
//print all record
void print(char ID[Max_No_Record][Max_Len_ID],char grade[Max_No_Record][Max_Len_grades],int no_records) {
for (int i=0; i
