How to initialize a 2D array with same values in c++

Question

WE can use fill_n function to initialize 1D array with value.

int table[20];
fill_n(table, 20, 100);

But how can we initialize 2D array with same values.

int table[20][20];
fill_n(table, sizeof(table), 100); //this gives error

Answer 1

You can use a pointer to the first element and a pointer to one past the last one:

int table[20][20];
int* begin = &table[0][0];
size_t size = sizeof(table) / sizeof(table[0][0]);
fill(begin, begin + size, 100);