How can I use vector for entering numbers? - c++

Question

I want to enter names, student numbers and student scores and display this information.
I used arrays in this way:
#include "stdafx.h"
#include <iostream>
#include <string>
#define size 3
using namespace std;
class student{
public:
void vrod();
void dis();
int stno,score,i,n;
};
void student::vrod(){
cout<<"name=";
cin>>name;
cout<<"stno=";
cin>>stno;
cout<<"score=";
cin>>score;
}
void student::dis(){
cout<<"name="<<name<<"\n"<<"stno="<<stno<<"\n"<<"score="<<score<<"\n";
}
int main(){
int i, j=0,n,;
string h;
student st[size];
while (j<3){
st[j].vrod();
j++;}
j=0;
while (j<3){
st[j].dis();
j++;}
cin.get();
cin.get();
}
According to recommendation of my friends, I used vector in this way:
#include "stdafx.h"
#include<iostream>
#include<vector>
#include<sstream>
#include<string>
#define n 3
using namespace std;
int main()
{
int input;
string names;
vector<int> stno,score;
vector<string> name;
cout<<"Enter the number of inputs: ";
cout << "Enter your numbers to be evaluated: " << endl;
for(int i=0;i<n;i++){
cout<<"student No.=";
cin >> input;
stno.push_back(input);
}
for(int i=0;i<n;i++){
cout<<"scor=";
cin >> input;
score.push_back(input);
}
for(int i=0;i<n;i++){
cout<<"name=";
cin >> names;
name.push_back(names);
}
for(int i=0;i<stno.size();i++)
cout<<stno[i];
for(int i=0;i<score.size();i++)
cout<<score[i];
for(int i=0;i<name.size();i++)
cout<<name[i];
cin.get();
cin.get();
}
Do you have any opinion to improve the second code written via vector? Can I save information from one student including student numbers and student scores in one position in vector like arrays? I mean for example if my n is 3, I enter the information of students in three positions like arrays(student st[size];)

Answer 1

Can I save information from one student including student numbers and
student scores in one position in vector like arrays? I mean for
example if my n is 3, I enter the information of students in three
positions like arrays(student st[size];)
Yes you can. A std::vector is a dynamic array that expands. So you could do something like this...
std::vector<student> my_vector;
for(int i = 0; i < n; i++)
{
student new_student;
cout << "Number: "
cin >> new_student.number;
cout << "Score: "
cin >> new_student.score;
cout << "Name: "
cin >> new_student.name;
my_vector.push_back(new_student);
}
//Accessing
std::cout << "Hello my name is: " + my_vector[0].name;
//Setting
vector[0].name = "Cranky Kong";
std::cout << "Hello my name is: " + my_vector[0].name;