function.cpp

#include <iostream>
#include <cstring>

class Student
{
  private:
    char name[4];
    int born;
    bool male; 
  public:
    void setName(const char * s)
    {
        strncpy(name, s, sizeof(name));
    }
    void setBorn(int b)
    {
        born = b;
    }
    // the declarations, the definitions are out of the class
    void setGender(bool isMale);
    void printInfo();
};

void Student::setGender(bool isMale)
{
    male = isMale;
}
void Student::printInfo()
{
    std::cout << "Name: " << name << std::endl;
    std::cout << "Born in " << born << std::endl;
    std::cout << "Gender: " << (male ? "Male" : "Female") << std::endl;
}

int main()
{
    Student yu;
    yu.setName("Yu");
    yu.setBorn(2000);
    yu.setGender(true);
    yu.printInfo();
    return 0;
}