Convert row. In column in 2d array

Question

C language

Answer 1

This process is known as transpose.
#include <stdio.h>

#define M 3
#define N 4

int main(void) {
int arr[M][N] = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12}
};

int transposed[N][M];

for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
transposed[j][i] = arr[i][j];
}
}

// print the transposed array
for (int i = 0; i < N; i++) {
for (int j = 0; j < M; j++) {
printf("%d ", transposed[i][j]);
}
printf("\n");
}

return 0;
}