#include <algorithm>
#include <cctype>
#include <functional>
#include <iostream>
#include <string>
#include <vector>
#include <ranges>
using namespace std;
struct student
{
string name;
string roll;
string dob;
string departmnt;
};
int main()
{
auto show_student = [](const student& s)
{
cout <<"Name: "<< s.name << endl;
cout <<"Roll: "<< s.roll << endl;
cout <<"DOB: "<< s.dob << endl;
cout <<"Department: "<< s.departmnt << endl;
};
auto show_data = [](const string& s)
{
cout << s << endl;
};
auto uppercase = [](student s) -> student {
std::transform(s.name.begin(), s.name.end(), s.name.begin(), ::toupper);
return s;
};
auto formatname = [](const string& s) -> string {
std::string name = "";
bool upper = true;
for(int i=0;i<s.size();i++)
{
if(s[i] >= 'a' && s[i] <= 'z')
{
if(upper)
{
name.push_back( (s[i] - 'a') + 'A');
upper = false;
}
else
name.push_back( s[i] );
}
else if(name.size() > 0 && (s[i]=='.' || s[i]==' '))
{
if(name[name.size()-1]=='.' || name[name.size()-1]==' ')
{
}
else
{
name.push_back( s[i] );
if(s[i]=='.')
name.push_back(' ');
}
upper = true;
}
else if(s[i] >= 'A' && s[i] <= 'Z')
{
if(upper)
{
name.push_back( s[i]);
upper = false;
}
else
name.push_back( (s[i]-'A' + 'a') );
}
}
return name;
};
vector<student> students;
students.push_back({.name="MD. NAzmul KIBRia", .roll="0304015", .dob="01-01-1985", .departmnt="CSE"});
students.push_back({.name="Md. Shakil Ahmed", .roll="0303013", .dob="01-01-1986", .departmnt="CIVIL"});
students.push_back({.name="Md. Rezwan Salam", .roll="0302025", .dob="01-01-1984", .departmnt="ELECTRICAL"});
students.push_back({.name="md.omar faruque", .roll="0304020", .dob="01-01-1983", .departmnt="CSE"});
std::ranges::sort(students, [](auto&l, auto&r){return l.roll < r.roll; });
std::ranges::for_each(students, show_student);
std::cout <<std::endl<< "CSE students: " << std::endl;
auto cse_students = students | std::views::filter([](const student&s){ return s.departmnt == "CSE";});
std::ranges::for_each(cse_students, show_student);
std::cout <<std::endl<< "CSE Student Names: " << std::endl;
std::ranges::for_each(students | std::views::filter([](const student&s){ return s.departmnt == "CSE";})
| std::views::transform([](const student&s) -> std::string {return s.name;})
| std::views::transform(formatname)
,show_data);
std::cout <<std::endl<< "CSE Student Rolls: " << std::endl;
std::ranges::for_each(students | std::views::filter([](const student&s){ return s.departmnt == "CSE";})
| std::views::transform([](const student&s) -> std::string {return s.roll;})
,show_data);
std::cout << std::endl<<"============" << std::endl;
std::ranges::for_each(students, show_student);
return 0;
}
Outputs:
Name: Md. Rezwan Salam
Roll: 0302025
DOB: 01-01-1984
Department: ELECTRICAL
Name: Md. Shakil Ahmed
Roll: 0303013
DOB: 01-01-1986
Department: CIVIL
Name: MD. NAzmul KIBRia
Roll: 0304015
DOB: 01-01-1985
Department: CSE
Name: md.omar faruque
Roll: 0304020
DOB: 01-01-1983
Department: CSE
CSE students:
Name: MD. NAzmul KIBRia
Roll: 0304015
DOB: 01-01-1985
Department: CSE
Name: md.omar faruque
Roll: 0304020
DOB: 01-01-1983
Department: CSE
CSE Student Names:
Md. Nazmul Kibria
Md. Omar Faruque
CSE Student Rolls:
0304015
0304020
============
Name: Md. Rezwan Salam
Roll: 0302025
DOB: 01-01-1984
Department: ELECTRICAL
Name: Md. Shakil Ahmed
Roll: 0303013
DOB: 01-01-1986
Department: CIVIL
Name: MD. NAzmul KIBRia
Roll: 0304015
DOB: 01-01-1985
Department: CSE
Name: md.omar faruque
Roll: 0304020
DOB: 01-01-1983
Department: CSE
