How to assign 2D array with random numbers

[alexdieter]

How do I assign 2D array with random numbers. I need to display this
C1 C2 C3 C4 C5
R1 2 3 4 1 6
R2 3 3 4 4 5
R3 4 5 3 6 8
R4 5 7 6 8 4
Please help fast.

[jonnin]

loop over it and assign.
see the reference pages here on <random> for examples of using that.
you can flatten a 2d array to 1d for stuff like this.

int x[10][10];
for(int i = 0; i < 100; i++) //100 is 10x10 rows *cols ..
x[i] = random value

[seeplus]

#include <iostream>
#include <random>
#include <utility>
#include <array>

constexpr size_t COLS { 5 }, ROWS { 4 };
constexpr std::pair range { 1, 9 };
std::mt19937 rng(std::random_device {}());

int main() {
	std::uniform_int_distribution distrib(range.first, range.second);
	std::array<std::array<int, COLS>, ROWS> nums;

	for (auto& r : nums)
		for (auto& c : r)
			c = distrib(rng);

	for (const auto& r : nums) {
		for (const auto& c : r)
			std::cout << c << ' ';

		std::cout << '\n';
	}
}

4 7 5 2 5
3 6 5 5 6
4 2 9 7 6
9 1 2 1 9

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