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

    #include <stdio.h>
        int main()
        {
            char num[25];
            fgets(num, 24, stdin);
            ungetc(num[0], stdin);
            scanf("%s", num);
            printf("%s\n", num);
            return 0;
        }
    

1. 1. First character of whatever user types first time and whatever user types second time

   
   
   

   2. Whatever string user types first time

   
   
   

   3. Whatever string user types second time

   
   
   

   4. Compilation Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   First character of whatever user types first time and whatever user types second time

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

    #include <stdio.h>
        int main()
        {
            int num;
            scanf("%d", &num);
            ungetc(num, stdin);
            scanf("%d", &num);
            printf("%d\n", num);
            return 0;
        }
    

1. 1. Whatever is typed by the user first time

   
   
   

   2. Undefined behaviour

   
   
   

   3. Compilation Error

   
   
   

   4. Whatever is typed by the user second time

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Undefined behaviour

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23. Which character of pushback is guaranteed per file?
    

1. 1. Depends on the platform

   
   
   

   2. Depends on the compiler

   
   
   

   3. False

   
   
   

   4. True

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   True

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24. ungetc() can be used only with getc().
    

1. 1. depends on the platform

   
   
   

   2. depends on the standard

   
   
   

   3. false

   
   
   

   4. true

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   false

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25. What is the return type of rand() function?
    

1. 1. int

   
   
   

   2. double

   
   
   

   3. long

   
   
   

   4. short

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   int

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