C Program to Interchange Elements of First and Last in a Matrix Across Rows
Here, we will see how to interchange the elements of first and last in a matrix across rows. Below are the examples:
Input: 6 3 1
4 5 2
2 4 9
Output: 2 4 9
4 5 2
6 3 1Input: 1 3 5
4 5 2
2 2 4
Output: 2 2 4
4 5 2
1 3 5
Approach: The approach is very simple, swap the elements of the first and last row of the matrix in order to get the desired matrix as output.
Below is the C program to interchange the elements of first and last in a matrix across rows:
C
// C program interchange the elements // of first and last in a matrix // across rows. #include <stdio.h> #define n 3 // Function to swap the element // of first and last row void interchangeFirstLast( int m[][n]) { int rows = n; // Swapping of element between first // and last rows for ( int i = 0; i < n; i++) { int t = m[0][i]; m[0][i] = m[rows - 1][i]; m[rows - 1][i] = t; } } // Driver code int main() { // Input matrix int m[n][n] = {{6, 3, 1}, {4, 5, 2}, {2, 4, 9}}; // Printing the input matrix printf ( "Input Matrix: \n" ); for ( int i = 0; i < n; i++) { for ( int j = 0; j < n; j++) { printf ( "%d " , m[i][j]); } printf ( "\n" ); } // call interchangeFirstLast(m) function. // This function swap the element of // first and last row interchangeFirstLast(m); // Printing the original matrix printf ( "\nOutput Matrix: \n" ); for ( int i = 0; i < n; i++) { for ( int j = 0; j < n; j++) { printf ( "%d " , m[i][j]); } printf ( "\n" ); } } |
Output
Input Matrix: 6 3 1 4 5 2 2 4 9 Output Matrix: 2 4 9 4 5 2 6 3 1
Time Complexity: O(n2)
Auxiliary Space: O(1)
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