Related to classes and why the code is giving an error - c++

Question

I want to add two numbers using OOP way. I am a complete newbie in C++ and hence need your help.
#include <iostream>
#include <string>
using namespace std;
class RunwalsClass{
public: // public function
void setName(string x){
name = x;
}
string getName(){
return name;
};
private: // good programming practice to make it private
string name;
};
class MyClass{
public:
void setSaying(string y){
CoolSaying = y;
}
string getSaying(){
return CoolSaying;
}
private:
string CoolSaying;
};
class FavSitcom{
public:
void setSitcom(string z){
BreakingBad = z;
}
string getSitcom(){
return BreakingBad;
}
private:
string BreakingBad;
};
class AddClass{
public:
void setNumbers(int a, int b){
int answer = a + b;
}
int getAddition(){
return answer;
}
private:
int answer;
};
int main(){
RunwalsClass RunwalsObject;
RunwalsObject.setName("Sir Buckey Wallace");
cout << RunwalsObject.getName() << endl;
MyClass MyObject;
MyObject.setSaying("Preaching to the choir! \n");
cout << MyObject.getSaying();
FavSitcom MyNewObject;
MyNewObject.setSitcom("My favorite Sitcom is: Breaking Bad \n");
cout << MyNewObject.getSitcom();
AddClass NewObject;
NewObject.setNumbers("answer: \n");
cout << AddObject.getAddition();
return 0;
}
error: #include <iostream>
#include <string>
using namespace std;
class RunwalsClass{
public: // public function
void setName(string x){
name = x;
}
string getName(){
return name;
};
private: // good programming practice to make it private
string name;
};
class MyClass{
public:
void setSaying(string y){
CoolSaying = y;
}
string getSaying(){
return CoolSaying;
}
private:
string CoolSaying;
};
class FavSitcom{
public:
void setSitcom(string z){
BreakingBad = z;
}
string getSitcom(){
return BreakingBad;
}
private:
string BreakingBad;
};
class AddClass{
public:
void setNumbers(int a, int b){
int answer = a + b;
}
int getAddition(){
return answer;
}
private:
int answer;
};
int main(){
RunwalsClass RunwalsObject;
RunwalsObject.setName("Sir Buckey Wallace");
cout << RunwalsObject.getName() << endl;
MyClass MyObject;
MyObject.setSaying("Preaching to the choir! \n");
cout << MyObject.getSaying();
FavSitcom MyNewObject;
MyNewObject.setSitcom("My favorite Sitcom is: Breaking Bad \n");
cout << MyNewObject.getSitcom();
AddClass NewObject;
NewObject.setNumbers("answer: \n");
cout << AddObject.getAddition();
return 0;
}
Reported error:
error: no matching function for call to 'AddClass::setNumbers(const char [10])
note: candidate: void AddClass::setNumbers(int, int)
note: candidate expects 2 arguments, 1 provided.

Answer 1

In main, your are passing a string as parameter to your setNumbers method. This line is wrong in main:
NewObject.setNumbers("answer: \n");
Your setNumbers function neeeds 2 integers as it is declared. Try:
int a = 10;
int b = 5;
NewObject.setNumbers(a, b);
Good luck in your OOP learning journey!
EDIT:
Also, in your setNumbers function, you must not redeclare answer because this variable is a class member. Remove int, just use answer inside setNumbers.

Answer 2

Yep so your function setNumbers() expects two integer arguments provided, i.e. NewObject.setNumbers(5, 10); which would set the number to 15. You have provided a string literal "answer: \n" which is not the same and therefore will not compile.