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.
Following is the syntax of the iscntrl() function :
#include<ctype.h> int iscntrl(int ch);
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();
}
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