2D array values C++

Question

I wanted to declare a 2D array and assign values to it, without running a for loop.

I thought I could used the following idea

int array[5] = {1,2,3,4,5};

Which works fine to initialize the 2D array as well. But apparently my compiler doesn't like this.

/*
 1   8  12  20  25
 5   9  13  24  26
*/

#include <iostream.h>

int main()
{
    int arr[2][5] = {0};   // This actually initializes everything to 0.
    arr [1] [] = {1,8,12,20,25}; // Line 11
    arr [2] [] = {5,9,13,24,26};
    return 0;
}

J:\CPP\Grid>bcc32.exe Grid.cpp

Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland

Grid.cpp:

Error E2188 Grid.cpp 11: Expression syntax in function main()

Error E2188 Grid.cpp 12: Expression syntax in function main()

Warning W8004 Grid.cpp 14: 'arr' is assigned a value that is never used in funct ion main()

* 2 errors in Compile *

Please help as to what is the right way to initialize the 2d array with my set of values.

Answer 1

Like this:

int main()
{
    int arr[2][5] =
    {
        {1,8,12,20,25},
        {5,9,13,24,26}
    };
}

This should be covered by your C++ textbook: which one are you using?

Anyway, better, consider using std::vector or some ready-made matrix class e.g. from Boost.