- C String Char Functions
- C String Char Functions
- C isalnum()
- C isalpha()
- C isblank()
- C iscntrl()
- C isdigit()
- C isgraph()
- C islower()
- C isprint()
- C ispunct()
- C isspace()
- C isupper()
- C isxdigit()
- C memchr()
- C memcmp()
- C memcpy()
- C memmove()
- C memset()
- C strcat()
- C strchr()
- C strcmp()
- C strcoll()
- C strcpy()
- C strcspn()
- C strerror()
- C strlen()
- C strncat()
- C strncmp()
- C strncpy()
- C strpbrk()
- C strrchr()
- C strspn()
- C strstr()
- C strtok()
- C strxfrm()
- C tolower()
- C toupper()
- C Input/Output Functions
- C Input/Output Functions
- C clearerr()
- C fclose()
- C feof()
- C ferror()
- C fflush()
- C fgetc()
- C fgetpos()
- C fgets()
- C fopen()
- C fprintf()
- C fputc()
- C fputs()
- C fread()
- C freopen()
- C fscanf()
- C fseek()
- C fsetpos()
- C ftell()
- C fwrite()
- C getc()
- C getchar()
- C gets()
- C perror()
- C printf()
- C putc()
- C putchar()
- C puts()
- C remove()
- C rename()
- C rewind()
- C scanf()
- C setbuf()
- C setvbuf()
- C snprintf()
- C sprintf()
- C sscanf()
- C tmpfile()
- C tmpnam()
- C ungetc()
- C vprintf()
- C vfprintf()
- C vsprintf()
- C vsnprintf()
- C vscanf()
- C vfscanf()
- C vsscanf()
- C Dynamic Allocation
- C Dynamic Allocation
- C calloc()
- C free()
- C malloc()
- C realloc()
- C Time/Date Functions
- C Time/Date Functions
- C asctime()
- C clock()
- C ctime()
- C difftime()
- C gmtime()
- C localeconv()
- C localtime()
- C mktime()
- C setlocale()
- C strftime()
- C time()
- C Programming Tutorial
- C Tutorial
- C Programming Examples
- C Programming Examples
- C Programming Test
- C Programming Test
- Give Online Test
- All Test List
C iscntrl()
The iscntrl() function returns non-zero if ch is a control character, which is ASCII environments is a value between zero and 0x1F, or equal to 0x7F (DEL). Otherwise zero is returned.
iscntrl() Syntax
Following is the syntax of the iscntrl() function :
#include<ctype.h> int iscntrl(int ch);
iscntrl() Example
Following program checks each character read from stdin and reports all control characters :
#include<ctype.h>
#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
char ch;
for(; ;)
{
ch = getchar();
if(ch == '.')
break;
if(iscntrl(ch))
printf("%c is a control char\n", ch);
}
getch();
}
« Previous Chapter Next Function »