Creating friend functions [closed] - c++

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I'm learning about friend functions and I was wondering how I could create a friend function in this code to print out the age, and irascibility of the Cat object.
#ifndef CAT H
#define CAT H
#include <string>
class Cat
{
private :
std :: string name ;
int age ;
float irascibility ;
public :
void setName(std :: string n) {name = n;}
std :: string getName ( ) {return name ; }
void setAge(int a) {age = a;}
int getAge( ) {return age ;}
void setIrascibility (float i) {irascibility = i;}
float getIrascibility ( ){return irascibility;}
std :: string meow(int rep)
{
std :: string output = " " ;
for (int i { 0 } ; i < rep − 1 ; i++)
output += "MEOW" ;
if ( rep != 0 )
output += "MEOW" ;
return output ;
}
};
#end if

Answer 1

Since the Cat class already has getters for all its data, just declare those as const and create a regular operator overload.
std::ostream& operator<<(std::ostream& os, const Cat& cat) {
return os << "Cat [name=" << cat.getName() << ", age=" << cat.getAge() << ']';
}

Answer 2

You could do it like this:
#ifndef CAT_H
#define CAT_H
#include <string>
#include <iostream>
class Cat
{
public:
void setName(std::string n)
{
name = n;
}
std::string getName()
{
return name;
}
void setAge(int a)
{
age = a;
}
int getAge()
{
return age;
}
void setIrascibility(float i)
{
irascibility = i;
}
float getIrascibility()
{
return irascibility;
}
std::string meow(int rep)
{
std::string output = " ";
for (int i{0}; i < rep - 1; i++)
output += "MEOW";
if (rep != 0)
output += "MEOW";
return output;
}
friend void printAge(const Cat &cat);
friend void printIrascibility(const Cat &cat);
private:
std::string name;
int age;
float irascibility;
};
void printAge(const Cat &cat)
{
std::cout << cat.age << std::endl;
}
void printIrascibility(const Cat &cat)
{
std::cout << cat.irascibility << std::endl;
}
#endif
But, friend functions are not needed here. although the class properties are private, it has public getters for these properties. Honestly I would do this class like this:
#include <string>
#include <iostream>
struct Cat
{
std::string meow(size_t rep)
{
std::string output{};
for (size_t i{0}; i < rep; i++)
output += "MEOW";
return output;
}
std::string name;
int age;
float irascibility;
};
inline void printAge(const Cat &cat) noexcept
{
std::cout << cat.age << std::endl;
}
inline void printIrascibility(const Cat &cat) noexcept
{
std::cout << cat.irascibility << std::endl;
}
I recommend you to read more c++ code, practice and more practice. Sorry for any mistake.