Description:
Check if a string is composed of numbers.
Syntax:
isdigit (string)
Note:
The function checks if the string string is composed of numbers. If string is an integer, look it up in the ASCII table to see if the corresponding characters are a number.
Parameter:
|
String |
String/ numeric expression |
Return value:
Boolean value
Example:
|
isdigit("123") |
true |
|
isdigit(123) |
false |
|
isdigit("abc") |
false |
|
isdigit("123ss") |
false |
Related function: