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

    #include <stdio.h>
    #include <stdarg.h>
        void function(int, ...);
        int main()
        {
            function(21, 13, 15, 17, 101, 113);
            return 0;
        }
        void function(int n, ...)
        {
            int num, k = 0;
            va_list start;
            va_start(start, n);
            while (k != 5)
            {
                num = va_arg(start, int);
                k++;
            }
            printf("%d", num);
        }
    

1. 1. 13

   
   
   

   2. 15

   
   
   

   3. 17

   
   
   

   4. 101

   
   
   

   5. 113

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: E

   113

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42. The standard header _______ is used for variable list arguments (…) in C.
    

1. 1. <stdarg.h>

   
   
   

   2. <math.h>

   
   
   

   3. <stdlib.h>

   
   
   

   4. <stdio.h>

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   <stdarg.h>

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43. What is the purpose of va_end?

1. 1. Must be called before the program returns

   
   
   

   2. Cleanup is necessary & Must be called before the program returns

   
   
   

   3. Cleanup is necessary

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Cleanup is necessary & Must be called before the program returns

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44. Which of the following data-types are promoted when used as a parameter for an ellipsis?
    

1. 1. int

   
   
   

   2. short

   
   
   

   3. char

   
   
   

   4. All of above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   char

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

    #include <stdio.h>
    #include <stdarg.h>
        int fun(...);
        int main()
        {
            char ch = 99;
            fun(ch);
            return 0;
        }
        int fun(...)
        {
            va_list list;
            char ch = va_arg(list, char);
            printf("%c\n", ch);
        }
    

1. 1. c

   
   
   

   2. 99

   
   
   

   3. Undefined behaviour

   
   
   

   4. Compilation Error

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Compilation Error
   

   main.c:3:13: error: ISO C requires a named argument before ‘...’
        int fun(...);
                ^~~
   main.c:10:13: error: ISO C requires a named argument before ‘...’
        int fun(...)
                ^~~
   In file included from main.c:2:0:
   main.c: In function ‘fun’:
   main.c:13:32: warning: ‘char’ is promoted to ‘int’ when passed through ‘...’
            char ch = va_arg(list, char);
                                   ^
   main.c:13:32: note: (so you should pass ‘int’ not ‘char’ to ‘va_arg’)
   main.c:13:32: note: if this code is reached, the program will abort
   

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