Expected unqualified-id for sum of numbers in 2D matrix

[saidas]

This code should return sum of all the numbers in a 5x5 matrix :

#include <iostream>

class solution{
    int sum = 0; 
for(int i=0;i<5;i++){
    for(int j=0;j<5;j++){
        sum += arr[i][j];
    }

}
};

int main(){
    int arr[5][5];
    for(int i=0; i<5; i++) for(int j=0; j<5; j++) std::cin >> arr[i][j];
    std::cout << &arr;
    return 0;
}

Error : Expected unqualified-id

[dev7060]

A class can only contain data members and member functions. Hence the functionality must be present in member functions.