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C Programming - Variable Number of Arguments

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Exercise

"Hold a true friend with both hands."
- (Proverb)
1. 

What will be the output of the program?

#include<stdio.h>
#include<stdarg.h>
void fun(char *msg, ...);

int main()
{
    fun("IndiaBIX", 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. IndiaBIX 1 7 11 0B. 1
C. 4D. 7

2. 

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. A 10 3.14
A 10 3.14
B. A 10 10 3.140000 Hello
A 10 10 3.140000 Hello
C. A 10 Hello
A 10 Hello
D. Error

3. 

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");
}

A. 2 4
3 6
B. 2 4 8
3, 6, 9, 7
C. 4 8
6 9 7
D. 1 1 1
1 1 1 1

4. 

What will be the output of the program?

#include<stdio.h>
#include<stdarg.h>
void display(int num, ...);

int main()
{
    display(4, 'A', 'B', 'C', 'D');
    return 0;
}
void display(int num, ...)
{
    char c, c1; int j;
    va_list ptr, ptr1;
    va_start(ptr, num);
    va_start(ptr1, num);
    for(j=1; j<=num; j++)
    {
        c = va_arg(ptr, int);
        printf("%c", c);
        c1 = va_arg(ptr1, int);
        printf("%d\n", c1);
    }
}

A. A, A
B, B
C, C
D, D
B. A, a
B, b
C, c
D, d
C. A, 65
B, 66
C, 67
D, 68
D. A, 0
B, 0
C, 0
C, 0

5. 

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. Dogs 12B. Cats 14
C. Boys 13D. Apple 12



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