C ctype isupper() Function
Example
Check if a character is an uppercase letter:
char c = 'b';
if (isupper(c)) {
printf("%c is an uppercase letter", c);
} else {
printf("%c is not an uppercase letter", c);
}
Try it Yourself »
Definition and Usage
The isupper()
function returns a non-zero value (equivalent to boolean true) if
a character is an uppercase letter.
The isupper()
function is defined in the <ctype.h>
header file.
Syntax
int isupper(int c);
Parameter Values
Parameter | Description |
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c | Required. The ASCII value of a character or an actual character |
Technical Details
Returns: | An int value which is non-zero (equivalent to boolean true) if the character is an uppercase letter.Otherwise it returns 0 (equivalent to boolean false). |
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