No suitable constructor to convert from int to emp

Question

My program simply is to increase the salary int the emp class throw the the function increase but I'm having this error int the call function line from the line : No suitable constructor to convert from int to emp

here 's my code :

#include <iostream>
#include <string>

using namespace std;

class emp
{
public:
int salary;
};

void increase(emp x,emp y)
{
    x.salary+=100;
y.salary+=250;

}

int main()
{
int value=0;
emp fst, scnd;
cin >> fst.salary >> scnd.salary;
increase(fst.salary,scnd.salary);
cout << fst.salary << endl << scnd.salary << endl; 

cin >> value;
return 0;
}

Answer 1

increase expects two emps as parameters, yet you pass in two ints.

Change

increase(fst.salary,scnd.salary);

to

increase(fst,scnd);

Your next question is going to be why the values don't change, so to save you the trouble - it's because you're passing by value, effectively changing copies of your original objects. You'll need to pass by reference:

void increase(emp& x,emp& y)

Answer 2

increase(fst.salary,scnd.salary); should be increase(fst,scnd);, void increase(emp x,emp y) ... should be void increase(emp& x,emp& y) ...

Answer 3

You need to pass emp not int. Further, you are passing parameters by value. Use this instead:

void increase(emp &x,emp &y)

And pass the struct variables; i.e. fst and scnd instead of fst.salary and scnd.salary. Refer this question for better understanding.