Using the iscntrl() function in C

The iscntrl() function in C is used to check whether a character is a control character. The function takes a character as input and returns a non-zero value if the character is a control character, or zero if the character is not a control character.

Here is an example of how to use the iscntrl() function:

#include <stdio.h>
#include <stdint.h>
#include <ctype.h>

int32_t main(int32_t argc, char const *argv[])
{
    char c = '\n';

    int32_t result = iscntrl(c);

    if (result > 0x00)
    {
        printf("The character is a control digit.\n");
    }
    else
    {
        printf("The character is not a control digit.\n");
    }

    return 0;
}

The iscntrl() function takes a character as input and returns a non-zero value if the character is a control character, or zero if the character is not a control character. In this example, the character '\n' is a control character, so the function will return a non-zero value and the printf() statement will print the output.

Explore the complete list of functions available in ctype header in C standard library.