I am trying to program a school bulletin (I'm sorry if that's not the right word, what I meant with "bulletin" is the thing were are the grades of each student. English isn't my 1° language) and I want to ask the user the name of the student and then create a
int student_name;
so I don't need to create a 1000 of
int student_1
int student_2
and then just use cin <<. So, how can I do that? I hope my question was easy to understand. Thanks!
#include <iostream>
#include <map>
#include <string>
void createStudent(std::map<string, int>& input)
{
std::string name;
int grade;
for(int i=0; i<1000; ++i)
{
std::cin>>name>>grade;
input.insert(std::pair<string, int>(name, grade));
}
return;
}
void showContentMap(std::map<string, int>& input)
{
for(int i=0; i<input.size(); ++i)
{
std::cout<<input[i].first<<" : "<<input[i].second<<std::endl;
}
return;
}
int main()
{
std::map<string, int> students;
createStudent(students);
showContentMap(students);
return 0;
}
Explanation:
createStudent() assigns into the parameter students their identifiers such as name and grade. It is known that the quantity of students is 1000.showContentMap() demonstrates the content of the parameter students.map<string, int> students.
using namespace std;, global variable, hardcoded std::cin, map passed by copy, ordered container even though no order required.
Since you want to create a system that allows you to add and remove student names, it is best to use something like std::vector<std::string> studentNames;. Every time that you want to append a new student name, you can use studentNames.pushBack("John Doe");.
Remember to #include <vector> it at the top of your code.
std::unordered_map<std::string, int>where the key is the student name and the value is a note. en.cppreference.com/w/cpp/container/unordered_mapstd::vectorand arrays and tables likestd::mapare for.