3.45_3.43_indexFor.cpp

#include<iostream>
#include<cstddef>
int main()
{
	int ia[3][4] = {1,2,3,4,5,6,7,8,9,10,11,12};
	for(auto row = 0; row < 3; ++row)
		for(auto col = 0; col < 4; ++col)
			std::cout << ia[row][col] << " "; 

	return 0;
}