Write a c program of 3*3 and find transpose of matrix without using another matrix?

Question

Suppose
Matrix a: Transpose of a:
1 2 3 1 5 8
5 6 7 2 6 9
8 9 0 3 7 0

Answer 1

If it will always be a 3 * 3 matrix and no other size will be used then;
Swap [0][1] with [1][0], [0][2] with [2][0], and [1][2] with [2][1] and it's done.

Answer 2

Transposing is a matter of swapping indices. If you read the values in as matrix[i][j], then print them out as matrix[j][i].