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  1. #include <stdio.h>
  2. void main()
  3. {
  4.    int i, j, flag=0, m, n;
  5.    printf("Enter the order of the matrix(in row×column format):");
  6.    scanf("%d×%d", &m, &n);
  7.    int mat[m][n];
  8.    printf("\nEnter the elements:\n");
  9.    for(i=0;i<m;i++)
  10.   {
  11.      for(j=0;j<n;j++)
  12.         scanf("%d ", &mat[i][j]);
  13.      printf("\n");
  14.   }
  15.   if(m==n)
  16.   {
  17.     for(i=0;i<m;i++) 
  18.    {
  19.      for(j=0;j<n;j++)
  20.     {
  21.        if(i!=j)
  22.        {
  23.         if(mat[i][j]==0)
  24.         {
  25.                      flag=0;
  26.           continue;
  27.         }
  28.         else 
  29.         {
  30.            flag=-1;
  31.            break;
  32.         }
  33.        }
  34.     }
  35.      if(flag==-1)
  36.            break;
  37.   }
  38.    if(flag==0)
  39.        printf("\nIt is a diagonal matrix");
  40.    else
  41.        printf("\nIt is not a diagonal matrix") ;
  42. }
  43. else
  44.        printf("\nIt is not a diagonal matrix");
  45. }
  46.  
Success #stdin #stdout 0s 5472KB
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stdin
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2 2
1 0
0 1
stdout
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Enter the order of the matrix(in row×column format):
Enter the elements:



It is not a diagonal matrix
https://ideone.com/q7fJpl
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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