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- isupper( ) function in C language checks whether given character is upper case or not. Syntax for isupper( ) function is given below.
int isupper ( int x );
Example program for isupper() function in C:
#include <stdio.h>
int main()
{
char ch;
printf("Enter any charactern");
scanf("%c", &ch);
if ( isupper ( ch ) )
printf ("nEntered character is uppercase character");
else
printf("nEntered character is not uppercase character");
}
Output:
| Enter any character A Entered character is upper case character |
..
Other Int, Char validation functions in C language:
- All “int, char validation functions” used in C language are given below. “ctype.h” header files support all these functions in C language.
- Click on each function name below for detail description and example programs.
| S.no | Function | Description |
| 1 | isalpha() | checks whether character is alphabetic |
| 2 | isdigit() | checks whether character is digit |
| 3 | isalnum() | checks whether character is alphanumeric |
| 4 | isspace() | checks whether character is space |
| 5 | islower() | checks whether character is lower case |
| 6 | isupper() | checks whether character is upper case |
| 7 | isxdigit() | checks whether character is hexadecimal |
| 8 | iscntrl() | checks whether character is a control character |
| 9 | isprint() | checks whether character is a printable character |
| 10 | ispunct() | checks whether character is a punctuation |
| 11 | isgraph() | checks whether character is a graphical character |
| 12 | tolower() | checks whether character is alphabetic & converts to lower case |
| 13 | toupper() | checks whether character is alphabetic & converts to upper case |
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