Got this error

Question

public class FindError {
public static void main(String[] args) {
int[][] matrix = {{1}, {2}, {3}, {4}, {5}, {6}};
System.out.println(m(matrix, 1)); //error: incompatible types: int[][] cannot be converted to int
}

public static int m(int matrix, int column) {
int sum = 0;
for (int i = 0; i < matrix.length; i++) //error: int cannot be dereferenced
sum += matrix[i][column]; //error: array required, but int found
return sum;
}
}

Answer 1

in public static int m the parameter matrix you must change it in int matrix[ ]

Answer 2

so
public static int m(int matrix [ ] [ ], int column)

Answer 3

Thank you, So how about the int[][]cannot be converted to int error?

Answer 4

because only int is a variable that stores a number,
int [ ] [ ] is a matrix with many numbers, so in the function you wrote int matrix but matrix isn't an int variable, it is an int [ ] [ ] variable so you pass all numbers that it stores

Answer 5

Sorry so what should i change?

Answer 6

the type of first parameter to int matrix [ ] [ ]

Answer 7

It show the same error:(

Answer 8

public class FindError {
public static void main(String[] args) {
int[][] matrix = {{1}, {2}, {3}, {4}, {5}, {6}};
System.out.println(m(matrix, 6));
}

public static int m(int matrix [][], int row) {
int sum = 0;
for (int i = 0; i < row ; i++)
sum += matrix[i][0];
return sum;
}
}
try this

Answer 9

I changed the "column" to "row" because the matrix is
1
2
3
4
5
6
(6 row, 1 column)
we must do the sum of this numbers,
the variable i at beginning stores 0; this indicate the row that start from 0 to 5 (row-1) so
sum+=matrix[i](the row) [0] (because it has only 1 column)
after the for loop the function return sum=21

Answer 10

Get it omg thank you thank you now i understand it thank you again may god bless you leo flameee:)))))

Answer 11

you're welcome :D

Answer 12

Java has two different types of variables: primitive and objects and only objects are reference types. The type int is a primitive and not an object. Dereferencing is the process of accessing the value referred to by a reference . Since, int is already a value (not a reference), it can not be dereferenced. Primitives (byte, char, short, int, long, float, double, boolean) are not objects and do not have member variables or methods. They're just simple values . So you cannot do somePrimitive.something().

http://net-informations.com/java/err/dereferenced.htm