C-Variable Numbers and Arguments Questions and Answers
C-Variable Numbers and Arguments
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28 questions
1. What will be the output of the program?
#include<stdio.h>
#include<stdarg.h>
void fun1(char, int, int *, float *, char *);
void fun2(char ch, ...);
void (*p1)(char, int, int *, float *, char *);
void (*p2)(char ch, ...);
int main()
{
char ch='A'; int i=10;
float f=3.14; char *p="Hello";
p1=fun1;
p2=fun2;
(*p1)(ch, i, &i, &f, p);
(*p2)(ch, i, &i, &f, p);
return 0;
}
void fun1(char ch, int i, int *pi, float *pf, char *p)
{
printf("%c %d %d %f %s \n", ch, i, *pi, *pf, p);
}
void fun2(char ch, ...)
{
int i, *pi; float *pf; char *p;
va_list list;
printf("%c ", ch);
va_start(list, ch);
i = va_arg(list, int);
printf("%d ", i);
pi = va_arg(list, int*);
printf("%d ", *pi);
pf = va_arg(list, float*);
printf("%f ", *pf);
p = va_arg(list, char *);
printf("%s", p);
}
- A 10 3.14 A 10 3.14
- A 10 10 3.140000 Hello A 10 10 3.140000 Hello
- A 10 Hello A 10 Hello
- Error
2. What will be the output of the program?
#include<stdio.h>
#include<stdarg.h>
void dumplist(int, ...);
int main()
{
dumplist(2, 4, 8);
dumplist(3, 6, 9, 7);
return 0;
}
void dumplist(int n, ...)
{
va_list p; int i;
va_start(p, n);
while(n-->0)
{
i = va_arg(p, int);
printf("%d", i);
}
va_end(p);
printf("\n");
}
- 2 4 3 6
- 2 4 8 3, 6, 9, 7
- 4 8 6 9 7
- 1 1 1 1 1 1 1
3. 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);
}
- Dogs 12
- Cats 14
- Boys 13
- Apple 12
4. What is the purpose of variable arguments (varargs) in C?
- To allow functions to accept a fixed number of arguments
- To enable functions to accept variable number of arguments
- To declare variables with dynamic types
- To create variable-sized arrays
5. Which header file is required for using variable arguments in C?
- stdlib.h
- stdarg.h
- varargs.h
- stdio.h
6. What is the correct syntax for a function with variable arguments?
- void func(...)
- void func(int args...)
- void func(int count, ...)
- void func(...int args)
7. Which macro is used to initialize the argument pointer in variable functions?
- va_init
- va_begin
- va_start
- va_list
8. What does the va_arg macro do?
- Starts the argument list
- Ends the argument list
- Retrieves the next argument
- Counts the number of arguments
9. Which macro must be called before returning from a variable argument function?
- va_start
- va_clean
- va_finish
- va_end
10. What type is used to declare a variable for accessing variable arguments?
- va_args
- va_list
- arg_list
- variable_args