STRING::ISINTEGER 1g 2024-04-10 laplante@plcb.ca GOWEB/STRING — Check for Integer Numbers

title: “STRING::ISINTEGER” version: “1.0.0” date: 2024-04-10 author: “laplante@plcb.ca” section: “1g”

category: “GOWEB/STRING”

Name

string::isinteger Check for Integer Numbers

Synopsis

string::isinteger(string[, error: variable, string...])
isinteger(string[, error: variable, string...])

Description

The isinteger function checks whether the provided value or string represents a valid integer number.

It accepts:

• Integer literals — e.g., 123, -45, 0
• Strings containing only integer values — e.g., "456", "-12"

It does not accept:

• Floating point numbers (3.14)
• Strings with decimal points ("4.5")
• Non-numeric characters
• Empty strings

Examples

res={{
    isinteger(123); "\n";
    isinteger(3.1415926535); "\n";
    isinteger("3.1415926535"); "\n";
    isfloat("3.14159.26535"); "\n";
    isinteger("45.65"); "\n";
    isinteger(".65"); "\n";
    isinteger("4."); "\n";
    isinteger("4"); "\n";
    isinteger("+4.."); "\n";
    isinteger("+."); "\n";
    isinteger("."); "\n";
    isinteger(""); "\n";

    isinteger("56a"); "\n";
    isinteger("a56"); "\n";
    isinteger(""); "\n";

    isinteger("abc"); "\n";
    isinteger("123"); "\n";
    isinteger("1.2"); "\n";
    isinteger(-12); "\n";
}}.

Returns:

res=true
false
false
false
false
false
false
true
false
false
false
false
false
false
false
false
true
false
true

Author

laplante@plcb.ca

See Also

• string::isfloat
  
• String functions
  
• Index
  

Version

• 1.0.0 — 2024-04-10 — Initial version