isspace

The isspace function in C is a standard library function that is used to check whether a given character is a whitespace character. It is defined in the ctype.h header file. The function takes an integer parameter, which is typically the ASCII value of the character to be checked, and returns a non-zero value if the character is a whitespace character, and 0 otherwise. The function considers the characters ' ', '\t', '\n', '\r', '\f', and '\v' as whitespace characters.

Here is an example usage of the isspace function:

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

int main() {
    char ch = ' ';

    if (isspace(ch)) {
        printf("The character is a whitespace character.\n");
    } else {
        printf("The character is not a whitespace character.\n");
    }

    return 0;
}

This example checks whether the character ch is a whitespace character using the isspace function. If it is, it prints a message indicating that the character is a whitespace character. Otherwise, it prints a message indicating that the character is not a whitespace character.