Help me with code

Question

#include <iostream>
#include <vector>

using namespace std;

class my_class{
public:
void nextLine(){//helps to generate inputed line
int i = 0;
while(i<3){
i++;
cin >> a;
if(!cin){
cout << "wrong character, try again";
continue;
}
c.push_back(a);
}
for(int i = 0; i<3; i++){

//here is where problem begins i think🤔

*sum = *sum + c[i];
}
proceed.push_back(*sum);
delete sum;
}

void check(){//checks if it is a magic square
if(proceed[0] == proceed[1] == proceed[2]){
cout << "inputed numbers are magic square: " << proceed[0]; }
else{
cout << "inputed numbers are not magic square: first line sum " << proceed[0] << " - " << "second line sum " << proceed[1] << " - third line sum " << proceed[2];}
}

private:
int *sum = new int;
int a;
vector<int> c;
vector<int> proceed;

}start;

int main(){

start.nextLine();
start.nextLine();
start.nextLine();

start.check();

return 0;
}

Answer 1

maybe there is a way how to point vector, just share your ideas🤗

Answer 2

i have already solved the problem, thanks to all who tried something☺