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C Programming :: Variable Number of Arguments

Variable Number of Arguments - Point Out Errors
Variable Number of Arguments - Yes / No Questions
Variable Number of Arguments - Find Output of Program
Variable Number of Arguments - True / False Questions

  1. Point out the error in the following program.

     #include
 #include
  fun(...);  
 
  int main() 
  {    
     fun(3, 7, -11.2, 0.66);     
     return 0; 
  } 
  fun(...)
  {    
      va_list ptr;    
      int num;   
      va_start(ptr, n);   
      num = va_arg(ptr, int);      
      printf("%d", num); 
 }

    2. A.

    Error: fun() needs return type
    B.

    Error: ptr Lvalue required
    C.

    Error: Invalid declaration of fun(...)
    D.

    No error

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  2. Point out the error if any in the following program (Turbo C).

     #include 
 #include
 void display(int num, ...); 

 int main() 
 {   
    display(4, 'A', 'a', 'b', 'c');     
    return 0;
 } 
 void display(int num, ...) 
 {   
     char c; int j;   
     va_list ptr;     
     va_start(ptr, num);   
     for(j=1; j
         printf("%c", c);  
    } 
}

    3. A.

    Error: unknown variable ptr
    B.

    Error: Lvalue required for parameter
    C.

    No error and print A a b c
    D.

    No error and print 4 A a b c

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  3. Point out the error in the following program.

      #include
  #include
  void varfun(int n, ...);  

  int main() 
  {    
       varfun(3, 7, -11, 0);     
       return 0; 
   } 
   void varfun(int n, ...) 
   {    
      va_list ptr;   
      int num;   
      num = va_arg(ptr, int);       
      printf("%d", num);
 }

    4. A.

    Error: ptr has to be set at begining
    B.

    Error: ptr must be type of va_list
    C.

    Error: invalid access to list member
    D.

    No error

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  4. Point out the error in the following program.

     #include
 #include 

 int main() 
 {    
     void display(char *s, int num1, int num2, ...);   
     display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0);   
     return 0; 
 }
 void display(char *s, int num1, int num2, ...) 
 {
    double c;  
    char s;   
    va_list ptr;   
    va_start(ptr, s); 
    c = va_arg(ptr, double);     
    printf("%f", c); 
}

    5. A.

    Error: invalid arguments in function display()
    B.

    Error: too many parameters
    C.

    Error: in va_start(ptr, s);
    D.

    No error

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  5. Point out the error in the following program.

     #include
 #include

  int main() 
  {  
       void display(int num, ...);     
       display(4, 12.5, 13.5, 14.5, 44.3);   
       return 0; 
  }
  void display(int num, ...) 
  {    
      float c; int j;   
      va_list ptr;     
      va_start(ptr, num);    
      for(j=1; j      
          printf("%f", c); 
     } 
 }

    6. A.

    Error: invalid va_list declaration
    B.

    Error: var c data type mismatch
    C.

    No error
    D.

    No error and Nothing will print

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  6. Point out the error in the following program.

    
 #include
 #include 
 void display(char *s, ...);
 void show(char *t, ...); 

 int main()
 {
     display("Hello", 4, 12, 13, 14, 44);  
     return 0; 
}
void display(char *s, ...) 
{
   show(s, ...); 
 }
 void show(char *t, ...)
 {
     int a;   
     va_list ptr;   
     va_start(ptr, s); 
     a = va_arg(ptr, int);      
     printf("%f", a);
  }

    7. A.

    Error: invalid function display() call
    B.

    Error: invalid function show() call
    C.

    No error
    D.

    Error: Rvalue required for t

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  7. Point out the error in the following program.

    
  #include
  #include
  void varfun(int n, ...); 
 
  int main() 
  {
     varfun(3, 7, -11.2, 0.66);     
     return 0;
  } 
  void varfun(int n, ...) 
  {
      float *ptr;   
      int num;     
      va_start(ptr, n);   
      num = va_arg(ptr, int);     
      printf("%d", num);
  }

    8. A.

    Error: too many parameters
    B.

    Error: invalid access to list member
    C.

    Error: ptr must be type of va_list
    D.

    No error

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