exercise/9.html at master · RajanTank/exercise · GitHub

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<!DOCTYPE html>
<html>
    <!--
      JavaScript program to check whether a matrix is a diagonal matrix or not. In linear algebra,
      a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero (the diagonal
      from the upper left to the lower right).

      for Example =>
      [1, 0, 0], [0, 2, 0], [0, 0, 3] ]) = true
      [1, 0, 0], [0, 2, 3], [0, 0, 3] ]) = false

    -->
  <head>
    Exciese No :9
  </head>

  <body>
    <script>
        function checkMatrix(){

          let a = new Array(3);

          for (let i = 0; i < 3; i++) {
            a[i] = new Array(3);
              for ( let j = 0; j < 3; j++) {
                a[i][j] = +prompt(`Enter [${i}] [${j}]:`);
              }
          }


          for (let i = 0; i < 3; i++) {
            for (let j = 0; j < 3; j++) {
              if(a[i][j] != 0   && i != j ){
                  return false;
              }
            }
          }
          return true;
        }

    alert(checkMatrix());

    </script>

  </body>

</html>