I don't understand why am i getting this error. Is it not the correct way of array initialization?

#include <iostream>
using namespace std;
int main()
{
    bool **arr = new bool *[5]; //rows
    for (int i = 0; i < 5; i  )
    {
        arr[i] = new bool[5]; //col
    }
    arr[5][5] = {
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},

                    };
    
}

CodePudding user response：

If your array sizes are known statically, at compile time, you can use std::array<T, N>:

#include <array>

std::array<std::array<bool, 5>, 5> arr = {{
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true}
}};

CodePudding user response：

In this statement

arr[5][5] = {
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true},
    {false,true,false,true,true},

                };

you are trying to assign a non-existent object (the valid range of indices for the both dimensions of the array is [0, 5)) of the type bool with an initializer list that contains more than one initializers.

So this statement must be removed.

Instead you could write in the for loop

for (int i = 0; i < 5; i  )
{
    arr[i] = new bool[5] {false,true,false,true,true}; 
}

Here is a demonstration program.

#include <iostream>

int main() 
{
    const size_t N = 5;

    bool **arr = new bool *[N]; //rows
    for ( size_t i = 0; i < N; i   )
    {
        arr[i] = new bool[N] {false,true,false,true,true};
    }

    std::cout << std::boolalpha;

    for (  size_t i = 0; i < N; i   )
    {
        for ( size_t j = 0; j < N; j   )
        {
            std::cout << arr[i][j] << ' ';
        }
        std::cout << '\n';
    }

    for ( size_t i = 0; i < N; i   )
    {
        delete [] arr[i];
    }
    delete [] arr;
}

The program output is

false true false true true 
false true false true true 
false true false true true 
false true false true true 
false true false true true 

Another approach is to allocate initially a two-dimensional array.

Here is a demonstration program.

#include <iostream>

int main() 
{
    const size_t N = 5;

    bool ( *arr )[N] = new bool [N][N]
    {
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true}
    };
    std::cout << std::boolalpha;

    for (  size_t i = 0; i < N; i   )
    {
        for ( size_t j = 0; j < N; j   )
        {
            std::cout << arr[i][j] << ' ';
        }
        std::cout << '\n';
    }

    delete [] arr;
}

The program output is the same as shown above

false true false true true 
false true false true true 
false true false true true 
false true false true true 
false true false true true 

Pay attention to that instead of manually allocating arrays you could use standard container std::vector<std::vector<bool>>.

Here is one more demonstration program.

#include <iostream>
#include <vector>

int main() 
{
    std::vector<std::vector<bool>> arr =
    {
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true},
        {false,true,false,true,true}
    };
    std::cout << std::boolalpha;

    for (  const auto &row : arr )
    {
        for ( const auto &item : row )
        {
            std::cout << item << ' ';
        }
        std::cout << '\n';
    }
}

Again the output is

false true false true true 
false true false true true 
false true false true true 
false true false true true 
false true false true true