problem with 2D vector

Hi all, i am new is C++.

i want to create a global 2D matrix and here is the code is use:

Code:

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#include <iostream>
#include <vector>

using namespace std;

vector<vector<int> >mat; // 2D matrix

void func(void){
   
    for(int i=0; i<5; i++)
            for(int j=0; j<5; j++)
                    mat[i][j] = 0;
   
}

int main(void){
    int size_x = 5; // X_dimension
    int size_y = 5; // Y_dimension
   
    mat.resize(size_x, vector<string>(size_y)); //resize 2D matrix
   
    for(int i=0; i<size_x; i++)
            for(int j=0; j<size_y; j++)
                    mat[i][j] = i;
   
    //print matrix
    for(int i=0; i<size_x; i++){
            cout << "\n";
            for(int j=0; j<size_y; j++){
                    cout << mat[i][j] << " ";
            }
    }
   
    func(); // create a zero matrix
   
    //print zero matrix
    cout << "\n\n";
    for(int i=0; i<size_x; i++){
            cout << "\n";
            for(int j=0; j<size_y; j++){
                    cout << mat[i][j] << " ";
            }
    }
   
    cout << "\n\n";
    system("PAUSE");
    return 0;
}

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i am doing something wrong but i have no idea how to correct my mistake.

Any help will be appreciated.

Quote:

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Originally Posted by msoh

i want to create a global 2D matrix and here is the code is use:

Code:

---

....

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i am doing something wrong but i have no idea how to correct my mistake.

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So what goes wrong?

Use { for .. for statements .. prob will be solved ..

How does that code compile ?

Code:

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vector<vector<int> >mat; // 2D matrix

// ...

mat.resize(size_x, vector<string>(size_y)); //resize 2D matrix

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Thanks all very much for the replies. I edited the first post.

Quote:

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Originally Posted by msoh

Thanks all very much for the replies. I edited the first post.

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sorry but how can i edit my first post to correct my mistake. if this is not possible then the change i would do is what Philip Nicoletti wrote. Thanks again for the replies everyone.