c style string and dynamic allocation in c++ -

i must implement bunch of methods allocates, modify , free 2d array of c-style string. cannot use string nor vectors nor stl container.

getnewmat :

char*** getnewmat(int w, int h){     char*** newmat = new char**[h];     for(int = 0 ; < h ; i++){         newmat[i] = new char*[w];         for(int j = 0 ; j < w ; j++)             newmat[i][j] = null;     }     return newmat; } 

fillmat

void fillmat(char***mat, int x, int y, char* newel){     mat[y][x] = newel; //this produce segfault (even index) } 

showmat :

void showmat(char*** mat, int w, int h){     for(int = 0 ; < h ; i++){         for(int j = 0 ; j  < w ; j++)             cout << mat[i][j];       }     cout << endl; } 

so, can please tell me what's wrong this?

in fillmat method this:

mat[y][x] = newel; 

where x , y dimensions of 2 ranks of array. line cause segmentation fault because you're going outside bounds of array. mat indexed 0 length - 1 , setting x , y going 1 outside bounds of array.

maybe meant loop through , set them:

for (int = 0; < y; ++i) {      (int k = 0; k < x; ++k)          mat[i][k] = newel; } 

moreover, inside showmat function have this:

cout << showmat[i][j];   

i think meant mat:

cout << mat[i][j];