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POglobal variables and mulidimensional arrays outside of main in c++
 

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  1. POglobal variables and mulidimensional arrays outside of main in c++
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    <p><strong>EDIT #1</strong> So I think my solution is to pass the class around through the functions, si then I have to get the size values in main and pass them into the class. So how would I create a multidimensional array within the class based on 2 int values? This is what I have, but I get the error "`ii' cannot appear in a constant-expression "</p> <pre><code>class tempHolder{ public: bool C1[col1][row1]; tempHolder(){ } tempHolder(int i, int ii){ int* C1 = new bool[i][ii]; } } </code></pre> <hr> <p>So my program has a multidimensional array, but I'm using global variables (which I know is bad style) to declare the size of the array. The problem is that I also pass this array to functions and I use it in a class, like the code below...</p> <pre><code>#include &lt;iostream&gt; using namespace std; const int row1 = 12; const int col1 = 32; class tempHolder{ public: bool C1[col1][row1]; void operator=(bool C2[col1][row1]){ for(int i=0;i&lt;row1;i++) for(int ii=0;ii&lt;col1;ii++) C1[i][ii] = C2[i][ii]; } }; void printTable(bool CC[][row1], int, bool); int main(int argc, char *argv[]) { col1=5; //error bool C1[col1][row1]; </code></pre> <p>So I want to be able to change the values of row1 and col1 right at the beginning of main, which would then change the array size for the entire program. If I declare the global variables like above, then the program compiles, but since they are constants, I won't be able to change them. I can't use a #define because those are not changeable at all. So what can I do to resize the array for the entire program?</p>
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    1. COYou can use dynamic allocation with `new` and `delete` to change the size of your array. Or better yet, just use a std::vector for your multidimensional array instead of raw arrays.
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