Question

For C++

Create a student structure that has fields for first name, last name, hometown, state, year in college and major. Keep the number of students to a reasonabe level. Place each structure into an array sorted by last name and within last name, by first name. Read the student information from a file and print the sorted array to the screen and then to an output file.

I was using the code below to guide me but it keeps giving out an error saying "strcmp was not declared in this scope".

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

//Structure
struct Student
{
string firstName, lastName, homeTown, state, major;
int year;
};

//Main method
int main()
{
//Creating an array of structs
struct Student students[50];
int i, j, stuCnt=0;
struct Student temp, sTemp;

//File for reading
fstream fin("indata9.txt", ios::in);

//File for writing
fstream fout("outdata9.txt", ios::out);

//Reading data from file
while(fin.good())
{
fin >> temp.firstName >> temp.lastName >> temp.homeTown >> temp.state >> temp.year >> temp.major;
//Storing data
students[stuCnt] = temp;
stuCnt++;
}

//Closing file
fin.close();

//Sorting array
for(i=0; i<stuCnt; i++)
{
for(j=i; j<stuCnt; j++)
{
//Comparing students
if(strcmp(students[i].lastName.c_str(), students[j].lastName.c_str()) > 0)
{
//Swapping
sTemp = students[i];
students[i] = students[j];
students[j] = sTemp;
}
//Comparing students
else if(students[i].lastName == students[j].lastName)
{
//Sorting on first name
if(strcmp(students[i].firstName.c_str(), students[j].firstName.c_str()) > 0)
{
//Swapping
sTemp = students[i];
students[i] = students[j];
students[j] = sTemp;
}
}
}
}

cout << "\n\n Students: \n\n";

//Printing array to console
for(i=0; i<stuCnt; i++)
{
//Printing to console and to file
cout << "\n" << students[i].firstName << " " << students[i].lastName << " " << students[i].homeTown << " " << students[i].state << " " << students[i].year << " " << students[i].major;
fout << students[i].firstName << " " << students[i].lastName << " " << students[i].homeTown << " " << students[i].state << " " << students[i].year << " " << students[i].major << "\n";
}

fout.close();

cout << "\n";

return 0;
}

Answer 1

you need to include :

#include <string.h>

Here is code:

#include <iostream>

#include <fstream>

#include <string>

#include <string.h>

using namespace std;

//Structure

struct Student

{

string firstName, lastName, homeTown, state, major;

int year;

};

//Main method

int main()

{

//Creating an array of structs

struct Student students[50];

int i, j, stuCnt = 0;

struct Student temp, sTemp;

//File for reading

fstream fin("indata9.txt", ios::in);

//File for writing

fstream fout("outdata9.txt", ios::out);

//Reading data from file

while (fin.good())

{

fin >> temp.firstName >> temp.lastName >> temp.homeTown >> temp.state >> temp.year >> temp.major;

//Storing data

students[stuCnt] = temp;

stuCnt++;

}

//Closing file

fin.close();

//Sorting array

for (i = 0; i < stuCnt; i++)

{

for (j = i; j < stuCnt; j++)

{

//Comparing students

if (strcmp(students[i].lastName.c_str(), students[j].lastName.c_str()) > 0)

{

//Swapping

sTemp = students[i];

students[i] = students[j];

students[j] = sTemp;

}

//Comparing students

else if (students[i].lastName == students[j].lastName)

{

//Sorting on first name

if (strcmp(students[i].firstName.c_str(), students[j].firstName.c_str()) > 0)

{

//Swapping

sTemp = students[i];

students[i] = students[j];

students[j] = sTemp;

}

}

}

}

cout << "\n\n Students: \n\n";

//Printing array to console

for (i = 0; i < stuCnt; i++)

{

//Printing to console and to file

cout << "\n"

<< students[i].firstName << " " << students[i].lastName << " " << students[i].homeTown << " " << students[i].state << " " << students[i].year << " " << students[i].major;

fout << students[i].firstName << " " << students[i].lastName << " " << students[i].homeTown << " " << students[i].state << " " << students[i].year << " " << students[i].major << "\n";

}

fout.close();

cout << "\n";

return 0;

}

indata9.txt

Omero Antuk Muncie Indiana 1991 Sebastiano
Mallory Shegog Springfield Missouri 1998 Bar
Simon Cockshot Tacoma Washington 2004 Junina
Emmott Fullom Columbus Ohio 2004 Burtie
Mirna Stygall Ogden Utah 1999 Shepard
Lilla Blakeborough Schenectady New York 1994 Nadean
Sebastiano Brangan Jackson Mississippi 2009 Milissent
Wyatan Gogin Rochester New York 2002 Haskell
Donica Moreby Des Moines Iowa 2007 Donia

Output: