Example Code and Test

Multiplying matrices

      float m[3][3], m1[3][3], m2[3][3];
      double sum;
      int i, j, k;

      /* Code to initialize m1 and m2. */

      /* Compute m = m1 * m2. */
      for ( i = 0; i < 3; i++ )
      { for ( j = 0; j < 3; j++ )
        { sum = 0.0;
          for ( k = 0; k < 3; k++ )
          { sum += m1[i][k] * m2[k][j];
          }
          m[i][j] = sum;
        }
      }

• If you understand this code, then you know enough C to code the algorithmic part of your code.

• At the beginning of this session, the above code would probably have been gibberish.

• If you can not understand this code, we are going too fast :-(