How can I transpose my Matrix to reverse columns and rows? - c

Question

I managed to do enter M, N, and accept its condition (0<N and M<=10), then create and apply desirable number into 2 matrices, which is called Matrix A and Matrix B, then the Matrix C is the plus of 2 Matrix A B.
The last one is the transpose, I have looked upon some sites, but since the ways they do are not like mine so I don't like to just "straightly" copy and paste it.
Here is my code:
#include <stdio.h>
int main()
{
int M, N, i, j;
printf ("Enter number M: ");
scanf("%d", &M);
printf ("Enter number N: ");
scanf("%d", &N);
if (0 < N && M <= 10) {
printf ("Accepted number M: %d\n", M);
printf("Accepted number N: %d\n", N);
}
else printf("Please enter valid number, which is 0 < N and M <= 10!");
int matrixA[M][N], matrixB[M][N], matrixC[M][N];
printf ("Enter matrix A: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
scanf("%d", &matrixA[i][j]);
}
}
printf ("Enter matrix B: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
scanf("%d", &matrixB[i][j]);
}
}
printf("Matrix A: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
printf("%d ", matrixA[i][j]);
}
printf("\n");
}
printf("Matrix B: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
printf("%d ", matrixB[i][j]);
}
printf("\n");
}
for (i=0; i<M; i++){
for (j=0; j<N; j++){
matrixC[i][j] = matrixA[i][j] + matrixB[i][j];
}
}
printf("Sum of matrix A and matrix B => Matrix C is: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
printf("%d ", matrixC[i][j]);
}
printf("\n");
}
int reverseMatrixC[N][M];
for (i=0; i<M; i++){
for (j=0; j<N; j++){
reverseMatrixC[j][i] = matrixC[i][j];
}
}
printf("Reverse columns and rows in matrix C: \n");
for (i=0; i<M; i++){
for (j=0; j<N; j++){
printf("%d ", reverseMatrixC[i][j]);
}
printf("\n");
}
}
The last one "Reverse columns and rows" are wrong and I don't know why, from my way of thinking, I'm switching M and N, then apply the previous Matrix C into a new variable which is reverseMatrixC, and then reverse i and j.
For example, I choose M = 2, N = 3.
and then I choose matrixA and matrixB these value:
1 2 3
4 5 6
The matrixC will display:
2 4 6
8 10 12
But when I transpose it, it'll display:
2 8 4
4 10 6
What I want is something like this:
2 8
4 10
6 12

Answer 1

You're very close. In fact, you're transposing matrixC correctly, the only problem is with how you're printing it out:
printf("Reverse columns and rows in matrix C: \n");
// reverseMatrixC has its rows and columns dimensions swapped, so N specifies its number of rows
for (i=0; i<N; i++){
// and M specifies its number of columns
for (j=0; j<M; j++){
printf("%d ", reverseMatrixC[i][j]);
}
printf("\n");
}
Also highly recommend to fix your indentation and use an IDE that formats for you, it makes reading code much easier.
Demo