21. What will be the output of the following C code?
    

    #include <stdio.h>
        #include <ctype.h>
        int main()
        {
            int num = 15;
            if (isspace(num))
                {
                printf("Space\n");
                }
            else
                {
                printf("Not Space\n");
                }
                return 0;
        }
    

1. 1. Compilation Error

   
   
   

   2. 15

   
   
   

   3. Not Space

   
   
   

   4. Space

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Not Space

---

22. What will be the output of the following C code?
    

    #include <stdio.h>
    #include <ctype.h>
        int main()
        {
            int n = ' ';
            if (isspace(n))
                {
                printf("Space\n");
                }
            else
                {
                printf("Not Space\n");
                }
                return 0;
        }
    

1. 1. Compilation Error

   
   
   

   2. Space

   
   
   

   3. Garbage value

   
   
   

   4. Not Space

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Space

---

---

23. Which is true about isaplpha(ch), where ch is an int that can be represented as an unsigned?
    

    char or EOF.isalpha(ch) returns
    

1. 1. 0 if ch is not alphabetic

   
   
   

   2. Non-zero if ch is alphabetic

   
   
   

   3. Both 0 if ch is not alphabetic & Non-zero if ch is alphabetic

   
   
   

   4. Non-zero if d is alphabetic

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Both 0 if ch is not alphabetic & Non-zero if ch is alphabetic

---

24. Which is true about isupper(ch), where ch is an int that can be represented as an unsigned?
    

    char or EOF.isupper(ch) returns
    

1. 1. 0 if ch is not upper case

   
   
   

   2. Non-zero if ch is upper case

   
   
   

   3. Both 0 if ch is not upper case & Non-zero if ch is upper case

   
   
   

   4. Nothing

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Both 0 if ch is not upper case & Non-zero if ch is upper case

---

---

25. Which is true about isalnum(ch), where ch is an int that can be represented as an unsigned?
    

     char or EOF.isalnum(ch) returns
    

1. 1. Nothing

   
   
   

   2. 0 if not isalpha(ch) or not isdigit(ch)

   
   
   

   3. Non-zero if isalpha(ch) or isdigit(ch)

   
   
   

   4. Both 0 if not isalpha(ch) or not isdigit(ch) & Non-zero if isalpha(ch) or isdigit(ch)

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Both 0 if not isalpha(ch) or not isdigit(ch) & Non-zero if isalpha(ch) or isdigit(ch)

---