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Home C Programming Variable Number of Arguments Comments

  • Question
  • The macro va_start is used to initialise a pointer to the beginning of the list of fixed arguments.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 


  • Variable Number of Arguments problems


    Search Results


    • 1. Point out the error in the following program.
      #include<stdio.h>
      #include<stdarg.h>
      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);
      }
      

    • Options
    • A. Error: too many parameters
    • B. Error: invalid access to list member
    • C. Error: ptr must be type of va_list
    • D. No error
    • Discuss
    • 2. Point out the error in the following program.
      #include<stdio.h>
      #include<stdarg.h>
      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);
      }
      

    • Options
    • A. Error: invalid function display() call
    • B. Error: invalid function show() call
    • C. No error
    • D. Error: Rvalue required for t
    • Discuss
    • 3. Point out the error in the following program.
      #include<stdio.h>
      #include<stdarg.h>
      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);
      }
      

    • Options
    • 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
    • Discuss
    • 4. Point out the error if any in the following program (Turbo C).
      #include<stdio.h>
      #include<stdarg.h>
      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<=num; j++)
          {
              c = va_arg(ptr, char);
              printf("%c", c);
          }
      }
      

    • Options
    • 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
    • Discuss
    • 5. Point out the error in the following program.
      #include<stdio.h>
      #include<stdarg.h>
      
      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);
      }
      

    • Options
    • A. Error: invalid arguments in function display()
    • B. Error: too many parameters
    • C. Error: in va_start(ptr, s);
    • D. No error
    • Discuss
    • 6. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. va_list is an array that holds information needed by va_arg and va_end

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. For a function receives variable number of arguments it is necessary that the function should receive at least one fixed argument.

    • Options
    • A. True
    • B. False
    • Discuss


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