Single character inbuilt Functions 2

7. isprint() :

This function helps us to check whether a specified character is a printable character or not.
Characters like ‘\t’, ‘\n’ etc are not printable character
Rest characters are printable

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   char ch='a'; /* is a printable character */
   /* char ch='\t'; */ /* is not a printable character */
   clrscr();
   if(isprint(ch))
   printf("it is a printable character");
   else
   printf("it is not a printable character");
   getch();
 }

8. ispunct() :

This function helps us to check whether the specified character is a punctuation character or not.
example:
The function returns nonzero/false if char is any of:
! ” # % & ‘ ( ) ; < = >> ?
[ \ ] * + , – . / : ^ _ { | } ~

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   /* char ch='"';  */ /* is a  punctuation character */
   char ch='a';  /* is not a  punctuation character */ 
   clrscr();
   if(ispunct(ch))
   printf("it is a punctuation character");
   else
   printf("it is not a punctuation character");
   getch();
 }

9. isspace() :

This function helps us to check whether character is a space, tab, carriage return, new line, vertical tab or formfeed or not.

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   //char ch=' '; /*  is a space character */
   char ch='a';  /*  is not a space character  */
   clrscr();
   if(isspace(ch))
   printf("it is a space character");
   else
   printf("it is not a space character");
   getch();
 }

10. isxdigit() :

This function helps us to check whether the character is a hexadecimal digit (0 to 9, a to f, A to F) or not.

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   char ch;
   clrscr();
   printf("Enter any character ");
   scanf("%c",&ch);
   if(isxdigit(ch))
   printf("it is a hexadecimal character");
   else
   printf("it is not a hexadecimal character");
   getch();
 }

11. tolower() :

This function helps to convert an upper case alphabet to its lower form.

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   char ch;
   clrscr();    
   printf("Enter any character ");
   scanf("%c",&ch);
   if(isupper(ch))
     printf("Lower form is %c",tolower(ch));
   else
     printf("character is not an upper case alphabet");
 getch();
 }

12. toupper() :

This function helps us to convert a lower case alphabet to its upper form.

#include<stdio.h>
 #include<conio.h>
 #include<ctype.h>
 void main()
 {
   char ch;
   clrscr();    
   printf("Enter any character ");
   scanf("%c",&ch);
   if(islower(ch))
     printf("Upper form is %c",toupper(ch));
   else
     printf("character is not a lower case alphabet");
 getch();
 }