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Variable Number of Arguments problems

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

  • Options
  • A. Error: fun() needs return type
  • B. Error: ptr Lvalue required
  • C. Error: Invalid declaration of fun(...)
  • D. No error
    • Discuss
  • 2. Point out the error in the following program. 
    #include<stdio.h>
#include<stdarg.h>

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<=num; j++)
    {
        c = va_arg(ptr, float);
        printf("%f", c);
    }
}

  • Options
  • A. Error: invalid va_list declaration
  • B. Error: var c data type mismatch
  • C. No error
  • D. No error and Nothing will print
    • Discuss
  • 3. 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
  • 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>
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
  • 6. 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
  • 7. 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
  • 8. The macro va_start is used to initialise a pointer to the beginning of the list of fixed arguments.

  • Options
  • A. True
  • B. False
    • Discuss
  • 9. 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
  • 10. va_list is an array that holds information needed by va_arg and va_end

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

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