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C program to interchange the rows in the matrix

Here, we are going to learn how to interchange the rows in the matrix in C programming language?
Submitted by Nidhi, on July 13, 2021

Problem statement

Given a matrix, and we have to interchange the specified rows in the matrix using C program.

Interchanging the rows in the matrix

The source code to interchange the rows in the matrix is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

C program to interchange the rows in the matrix

// C program to interchange the rows in matrix

#include <stdio.h>

int main()
{
    int Matrix[3][3] = {
        { 1, 2, 3 },
        { 4, 5, 6 },
        { 7, 8, 9 }
    };

    int i, j, n1, n2, temp;

    printf("Matrix before row exchange:\n");
    for (i = 0; i < 3; ++i) {
        for (j = 0; j < 3; ++j)
            printf(" %d", Matrix[i][j]);
        printf("\n");
    }

    printf("Enter two row numbers to be exchanged:");
    scanf("%d %d", &n1, &n2);

    //Exchange rows
    for (i = 0; i < 3; ++i) {
        temp = Matrix[n1 - 1][i];

        Matrix[n1 - 1][i] = Matrix[n2 - 1][i];
        Matrix[n2 - 1][i] = temp;
    }

    printf("Matrix after row exchange:\n");
    for (i = 0; i < 3; ++i) {
        for (j = 0; j < 3; ++j)
            printf(" %d", Matrix[i][j]);
        printf("\n");
    }

    return 0;
}

Output

RUN 1:
Matrix before row exchange:
 1 2 3
 4 5 6
 7 8 9
Enter two row numbers to be exchanged:1 3
Matrix after row exchange:
 7 8 9
 4 5 6
 1 2 3

RUN 2:
Matrix before row exchange:
 1 2 3
 4 5 6
 7 8 9
Enter two row numbers to be exchanged:1 2
Matrix after row exchange:
 4 5 6
 1 2 3
 7 8 9

RUN 3:
Matrix before row exchange:
 1 2 3
 4 5 6
 7 8 9
Enter two row numbers to be exchanged:2 3
Matrix after row exchange:
 1 2 3
 7 8 9
 4 5 6

Explanation

In the main() function, we created a 3X3 matrix matrix using the 2D array. Then we read row numbers to be exchanged. After that, we interchanged the rows and printed the updated matrix on the console screen.

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