Students, the iif function and the if statement in VB are similar in function and are used for conditional judgment. However, there are some differences in their use.
The format of the iif function is:iif(condition,"The result when the condition is true", "The result when the condition is false")。If the condition is true, the first result is returned, and if the condition is not true, the second result is returned. In this way, it seems that the iif function can replace the if statement. However, when the IIF function is executed, it is calculated at the same time"The result when the condition is true"with"The result when the condition is false", even if only one of the results is returned. Therefore, if calculated"The result when the condition is false"will lead to an error (such as an error of dividing by zero), then even if"conditions"If true, errors can also occur.
Let's look at an example:
In this example, we ask the user to enter a three-digit number through the input box, and then use the iif function to determine whether the number entered by the user is a three-digit number. If it's a three-digit number, it's returned"The number of digits is correct!", if not three digits, return"The number of digits is incorrect!"。
In general, although the iif function and the if statement in VB are functionally similar, the iif function is evaluated at the same time when executed"The result when the condition is true"with"The result when the condition is false", so in some cases, the iif function does not completely replace the if statement. I hope this article can help you and I wish you a happy Xi!