In C#, you can use the IsUpper() method see if a character is uppercase. This method indicates whether or not a certain character is uppercase.
Also, in a string, we can check if any of its characters is uppercase by specifying the index position of the character.
// for a character
IsUpper(Char)
// for a string
IsUpper(String, Int32)
Char: this is the character we want to check to see if it is uppercase.
String: this is a string that we want to check to see if any of its characters are uppercase.
Int32: this is the index position of the character in a string that we want to check to see if it is uppercase.
The value returned is a Boolean. true is returned if the character is uppercase, else false is returned.
In the coding example below, we create some characters and some strings and then check if some of the characters are uppercase using the IsUpper() method.
// use Systemusing System;// create classclass UppercaseChecker{// main methodstatic void Main(){// create characterschar c1 = 'H';char c2 = 'i';char c3 = 'E';// create stringsstring s1 = "Hi!";string s2 = "Edpresso";// check for uppercasebool a = Char.IsUpper(c1);bool b = Char.IsUpper(c2);bool c = Char.IsUpper(c3);bool d = Char.IsUpper(s1, 0); // first characterbool e = Char.IsUpper(s2, 1); // second character// print returned valuesConsole.WriteLine(a); // TrueConsole.WriteLine(b); // FalseConsole.WriteLine(c); // TrueConsole.WriteLine(d); // TrueConsole.WriteLine(e); // False}}
In line 10, line 11, and line 12 we created characters, c1, c2, and c3.
In line 15 and line 16, we created strings s1 and s2.
In line 19 to 21 we checked if the characters created were uppercase using the IsUpper() method.
In line 22 and line 23, we checked if some characters in the strings we created were uppercase using the IsUpper() method. We did this by passing the index positions of the characters.
Finally, we printed the results from line 26 to line 30.
When the code runs, we see that all the characters specified were uppercase characters except character c2 and the second character of string s2, which returned false.