This program, will ask user info using structs and for input using functions.

C++ struct_input_output_using_function

#include<iostream>
using namespace std;

struct Person {
    string name;
    int age;
    double salary;
};

// ProtoType
Person inputPerson(Person);

void displayData(Person);

int main() {

    cout << "How Many Person you need to enter? ";
    int size;
    cin >> size;

    for (int i = 0; i < size; i++) {
        Person person[size];
        person[i] = inputPerson(person[i]);
        displayData(person[i]);
    }

    return 0;
}


Person inputPerson(Person p) {
    cout << "Name : ";
    cin >> p.name;

    cout << "Age : ";
    cin >> p.age;

    cout << "Salary : ";
    cin >> p.salary;

    return p;
}

void displayData(Person p) {
    cout << "\nName is : " << p.name << endl;
    cout << "Age is : " << p.age << endl;
    cout << "Salary is : " << p.salary << endl << endl;
}