Transpose a Matrix

#include <stdio.h>
int main(void) {
    int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};
    // Visit columns first to print the transposed shape.
    for (int column = 0; column < 3; ++column) { for (int row = 0; row < 2; ++row) printf("%s%d", row ? " " : "", matrix[row][column]); puts(""); }
}

#include <array>
#include <iostream>
int main() {
    std::array<std::array<int, 3>, 2> matrix{{{{1, 2, 3}}, {{4, 5, 6}}}};
    // Visit columns first to print the transposed shape.
    for (size_t column = 0; column < 3; ++column) { for (size_t row = 0; row < 2; ++row) std::cout << (row ? " " : "") << matrix[row][column]; std::cout << '\n'; }
}