In this section we will learn what the isspace() function is and how to use it in C.
isspace() function in C
The `isspace()` function is used to check whether a character is a space character.
The prototype of the function exists in the `ctype.h` header file and we need to include this header file in order to use the ` isspace ()` function.
isspace() Function Syntax
Here’s the prototype of the ` isspace ()` function:
int isspace (int argument);
isspace() Function Parameters
This function takes one argument and that is the character that we want to check.
isspace() Function Return Value
The return value of the function is:
- 0: If the character was not a space-character.
- Positive value: if the character was in fact a space-character.
Example: check character for space
#include <stdio.h>
#include <ctype.h>
int main() {
char character = '\t';
char c2 = ';';
printf("The first character: %d \nThe second character: %d", isspace (character), isspace (c2));
return 0;
}
Output:
The first character: 8 The second character: 0
The first character in this example is `\t` and so the result of calling the `isalpha` function is a positive value because `\t` is a space character. But the result of the second character is 0 because the actual value of the character is `;` and it’s not a space character.
