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C program to interchange the diagonal elements in given matrix
Problem
We need to write a code to interchange the main diagonal elements with the secondary diagonal elements. The size of the matrix is given at runtime.
If the size of matrix m and n values are not equal, then it prints that the given matrix is not a square.
Only a square matrix can interchange the main diagonal elements and can interchange with the secondary diagonal elements.
Solution
The solution to write a C program to interchange the diagonal elements in given matrix is as follows −
The logic to interchange the diagonal elements is explained below −
for (i=0;i<m;++i){
a = ma[i][i];
ma[i][i] = ma[i][m-i-1];
ma[i][m-i-1] = a;
}Example
Following is the C program to interchange the diagonal elements in given matrix −
#include<stdio.h>
main (){
int i,j,m,n,a;
static int ma[10][10];
printf ("Enter the order of the matrix m and n
");
scanf ("%dx%d",&m,&n);
if (m==n){
printf ("Enter the co-efficients of the matrix
");
for (i=0;i<m;++i){
for (j=0;j<n;++j){
scanf ("%d",&ma[i][j]);
}
}
printf ("The given matrix is
");
for (i=0;i<m;++i){
for (j=0;j<n;++j){
printf (" %d",ma[i][j]);
}
printf ("
");
}
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 ("Matrix after changing the
");
printf ("Main & secondary diagonal
");
for (i=0;i<m;++i){
for (j=0;j<n;++j){
printf (" %d",ma[i][j]);
}
printf ("
");
}
}
else
printf ("The given order is not square matrix
");
}Output
When the above program is executed, it produces the following result −
Run 1: Enter the order of the matrix m and n 3x3 Enter the co-efficient 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 Matrix after changing the Main & secondary diagonal 3 2 1 4 5 6 9 8 7 Run 2: Enter the order of the matrix m and n 4x3 The given order is not square matrix
Updated on: 01-Sep-2021
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