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Function Details : isupper

intisupper(int c) ;

Return Type : int

Integer type (typically 4 bytes, -2,147,483,648 to 2,147,483,647)

Read about return values of isupper function .

1st Parameter Type : int

Integer type (typically 4 bytes, -2,147,483,648 to 2,147,483,647)

1st Parameter

The character to be tested, passed as an `unsigned char` cast to an `int`, or `EOF`

Read more about parameters of isupper in parameters section

The isupperfunction in C language Checks whether the character is an uppercase letter.

The isupper function tests whether c is an uppercase letter. In the default C locale, it includes the letters A through Z.

The isupperfunction takes 1 parameter:

•
int `c`: The character to be tested, passed as an `unsigned char` cast to an `int`, or `EOF`

Checks if the given character `c` is an uppercase alphabetic letter (`A-Z`). Returns a nonzero value if `c` is uppercase, and `0` otherwise.

The isupper function return value :

Returns non-zero if the character is an uppercase letter, 0 otherwise

Output

This example demonstrates basic usage of isupper with various characters.