C – toupper() function

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  • toupper( ) function in C language checks whether given character is alphabetic and converts to uppercase. Syntax for toupper( ) function is given below.

int toupper( int x );

Example program for toupper() function in C:

#include <stdio.h>

int main()
{
   char ch;
   printf("Enter any charactern");
   scanf("%c", &ch);

   if(isalpha(ch))
   printf ( "nEntered character is converted into " 
            "upper character : %cn",toupper ( ch ) ) ;
   else
   printf("Entered character is not an alphabetic");
}

Output:

Enter any character
a
Entered character is converted into upper character : A

..

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

Continue on C – Buffer manipulation functions….

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