isblank()

Header file:

    ctype.h

Synopsis:

    int isblank (int input)

Description:

    Checks whether the given input is a black character(space or tab) or not

Return Value:

    TRUE(a non-zero value) on success.

    0 on failure.

Sample Program:

---

  #include<stdio.h>
  #include<ctype.h>
  int main() {
        char c;
        printf("Enter your input:");
        /* give tab or space as input */
        c = getchar();

        if (isblank(c))
                printf("Given input is a space or a tab\n");
        else
                printf("neither tab nor space\n");


        printf("Return value of isblank: %d\n", isblank(c));
        return 0;
  }

  Output:

  Enter your input:   
  Given input is a space or a tab
  Return value of isblank: 1