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Variable Number of Arguments Questions And Answers.

Home » Programming » C Programming » Variable Number of Arguments » Levels

Exercise :: Variable Number of Arguments
1.What will be the output of the program?
#include<stdio.h>
#include<stdarg.h>
void fun(char *msg, ...);

int main()
{
    fun("PakMcqs", 1, 4, 7, 11, 0);
    return 0;
}
void fun(char *msg, ...)
{
    va_list ptr;
    int num;
    va_start(ptr, msg);
    num = va_arg(ptr, int);
    num = va_arg(ptr, int);
    printf("%d", num);
}
A. PakMcqs 1 7 11 0
B. 1
C. 4
D. 7
2.What will be the output of the program?
#include<stdio.h>
#include<stdarg.h>
void fun1(int num, ...);
void fun2(int num, ...);

int main()
{
    fun1(1, "Apple", "Boys", "Cats", "Dogs");
    fun2(2, 12, 13, 14);
    return 0;
}
void fun1(int num, ...)
{
    char *str;
    va_list ptr;
    va_start(ptr, num);
    str = va_arg(ptr, char *);
    printf("%s ", str);
}
void fun2(int num, ...)
{
    va_list ptr;
    va_start(ptr, num);
    num = va_arg(ptr, int);
    printf("%d", num);
}
A. Apple 12
B. Boys 13
C. Cats 14
D. Dogs 12
3.Point out the error in the 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);
}
A. Error: fun() needs return type
B. Error: ptr Lvalue required
C. Error: Invalid declaration of fun(...)
D. No Error
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);
    }
}
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
5.Point out the error in the 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);
}
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