Check Digit: 9 Digit Bank Check

Exercise 4. This softwar checks the validity of an identification number on a bank check. Use it to verify that 091902049 is valid. Now enter the same number with one digit incorrect. Was the error detected? Enter the number with two consecutive digits transposed. Was the error detected? Enter the number with the 2 and the 4 transposed. Was the error detected? Explain why or why not.

Enter the number here:

Click on to submit the number. Click on to clear the field.