C language isascii() function: determine whether a character is ASCII code

Function name : isascii

Header file : <ctype.h>

Function prototype : int isascii(int ch);

Function : Determine whether the character is ASCII code, that is, the character ASCII is between 0 and 127

Parameters: int ch character to be checked

Return value : ch is not ASCII, returns 0, ch is ASCII, returns non-0

Program example : Determine whether the input characters are ASCII characters

 #include<ctype.h>#include<stdio.h>intmain(){charch;printf(inputacharacter:);ch=getchar();if(isascii(ch)){printf(%cisascii.,ch);} else{printf(%cisnotascii.,ch);}putchar('n');return0;}

Running results:

 inputacharacter:ffisascii.