Method findColSum

MagicSquaresInGrid.java:26–43

(int grid[][], int r, int c)

    }

    public int findColSum(int grid[][], int r, int c){
       int sum=0;
       for(int j=0;j<3;j++){
        int colSum=0;
        for(int i=0;i<3;i++){
            int val = grid[r+i][c+j];
            colSum+=val;
        }
        if(j==0){
            sum = colSum;
        }else{
            if(sum!=colSum){
                return -1;
            }
        }
       }
       return sum;
    }

    public int diagonalSum(int grid[][], int r, int c){
        int sum1 = grid[r][c] + grid[r+1][c+1] + grid[r+2][c+2];