How to initialize 2D array with the same values in C ++
We can use the fill_n function to initialize a 1D array with a value.
int table[20];
fill_n(table, 20, 100);
But how can we initialize a 2D array with the same values.
int table[20][20];
fill_n(table, sizeof(table), 100); //this gives error
+3
Devesh Agrawal
source
to share
3 answers
Using fill_n you can write:
std::fill_n(&table[0][0], sizeof(table) / sizeof(**table), 100);
+2
manlio
source
to share
You can use a pointer to the first element and a pointer to one of the last:
int table[20][20];
int* begin = &table[0][0];
size_t size = sizeof(table) / sizeof(table[0][0]);
fill(begin, begin + size, 100);
+6
juanchopanza
source
to share
Use std::vector
:
std::vector<std::vector<int>> table(20, std::vector<int>(20, 100));
Everything is done and "filled" in the ad. No more code needed.
-1
Some programmer dude
source
to share