#main diagonal elements

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C Program to Accept a Matrix of Order MxN & Interchange the Diagonals

/* * C program to accept a matrix of order M x N and store its elements * and interchange the main diagonal elements of the matrix * with that of the secondary diagonal elements */ #include <stdio.h>a void main () static int array[10][10]; int i, j, m, n, a; printf("Enter the order of the matix \n"); scanf("%d %d", &m, &n); if (m == n) printf("Enter the co-efficients of the matrix\n"); for (i = 0; i < m; ++i) for (j = 0; j < n; ++j) scanf("%dx%d", &array[i][j]); printf("The given matrix is \n"); for (i = 0; i < m; ++i) for (j = 0; j < n; ++j) printf(" %d", array[i][j]); printf("\n"); for (i = 0; i < m; ++i) a = array[i][i]; array[i][i] = array[i][m - i - 1]; array[i][m - i - 1] = a; printf("The matrix after changing the \n"); printf("main diagonal & secondary diagonal\n"); for (i = 0; i < m; ++i) for (j = 0; j < n; ++j) printf(" %d", array[i][j]); printf("\n"); else printf("The given order is not square matrix\n");

Output

Enetr the order of the matix 2 2 Enter the co-efficients of the matrix 25 30 78 43 The given matrix is 25 30 78 43 The matrix after changing the main diagonal & secondary diagonal 30 25 43 78

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C program to find the sum of main diagonal and off diagonal elements of a matric

/* Write a C program to find accept a matric of order M x N and find the sum of the main diagonal and off diagonal elements */

#include <stdio.h> void main () { static int ma[10][10]; int i,j,m,n,a=0,sum=0; printf ("Enetr the order of the matix \n"); scanf ("%d %d",&m,&n); if ( m == n ) { printf ("Enter the co-efficients of the matrix\n"); for (i=0;i<m;++i) { for (j=0;j<n;++j) { scanf ("%d",&ma[i][j]); } } printf ("The given matrix is \n"); for (i=0;i<m;++i) { for (j=0;j<n;++j) { printf (" %d",ma[i][j]); } printf ("\n"); } for (i=0;i<m;++i) { sum = sum + ma[i][i]; a = a + ma[i][m-i-1]; } printf ("\nThe sum of the main diagonal elements is = %d\n",sum); printf ("The sum of the off diagonal elemets is = %d\n",a); } else printf ("The givan order is not square matrix\n"); }

Output

Enetr the order of the matix 3 3 Enter the co-efficients of the matrix 1 2 3 4 5 6 7 8 9 The given matrix is 1 2 3 4 5 6 7 8 9 The sum of the main diagonal elements is = 15 The sum of the off diagonal elements is = 15 Run 2 Enetr the order of the matix 2 3 The givan order is not square matrix

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C program to interchange the elements in multi dimensional matrix

/* Write a C program to accept a matrix of order M x N and store its elements  and interchange the main diagonal elements of the matrix with that of the secondary diagonal elements */

#include <stdio.h> void main () { static int ma[10][10]; int i,j,m,n,a; printf ("Enetr the order of the matix \n"); scanf ("%d %d",&m,&n); if (m ==n ) { printf ("Enter the co-efficients of the matrix\n"); for (i=0;i<m;++i) { for (j=0;j<n;++j) { scanf ("%dx%d",&ma[i][j]); } } printf ("The given matrix is \n"); for (i=0;i<m;++i) { for (j=0;j<n;++j) { printf (" %d",ma[i][j]); } printf ("\n"); } for (i=0;i<m;++i) { a = ma[i][i]; ma[i][i] = ma[i][m-i-1]; ma[i][m-i-1] = a; } printf ("THe matrix after changing the \n"); printf ("main diagonal & secondary diagonal\n"); for (i=0;i<m;++i) { for (j=0;j<n;++j) { printf (" %d",ma[i][j]); } printf ("\n"); } } else printf ("The givan order is not square matrix\n"); }

Output

Enetr the order of the matix 3 3 Enter the co-efficients of the matrix 1 2 3 4 5 6 7 8 9 The given matrix is 1 2 3 4 5 6 7 8 9 THe matrix after changing the main diagonal & secondary diagonal 3 2 1 4 5 6 9 8 7