C programming interview questions and answers [pdf]

[deepan sarkar]

C programming interview questions and answers [pdf]

Frequently asked in interview ...just a pdf..watch it out

Similar Threads:

• Ten Tough Questions For An Interview-Interview Questions & Answers Pdf Download
• Ten Tough Questions For An Interview-Interview Questions & Answers
• Asp.Net Interview Questions and Answers
• The Best Answers to Tough Interview Questions - How to face interview tricks
• The Best Answers to Tough Interview Questions How to face interview tricks

[prashant kannurkar]

it is very nice

[deepan sarkar]

thanx brother
.............................................................

[cutzas]

thanqs for the pdf bro

[anumul]

thanks
thanks
thanks
thanks
thanks
thanks

[sswati]

Thanku so much.

[jenny2765]

Thanks for sharing. I thought I would add another tip:
(1) If static storage in c will not work then what problem will you face?
(2) If extern storage in c will not work then what problem will you face?
(3) Why we cannot initialize extern variables?
(4) What is trigraph in C?
(5) Why char data type can store two characters at a time?
(6) What is prototype of printf function?

[itsmesamir]

thanks bro..it is very helpful....

[DeepChandNeel]

good study material

[Siddharth upmanyu]

hey frnts,

Some programming questions:

1. Consider the following program:


#include <stdio.h>
#include <setjmp.h>


static jmp_buf buf;


int main(void)
{
volatile int b = 3;


if (setjmp(buf) != 0)
{
printf("%d\n", b);
exit(0);
}
b = 5;
longjmp(buf, 1);
}
What is the output of this program?


(a) 3
(b) 5
(c) 0
(d) none of the above




2. Consider the following program:


#include <stdio.h>


int main(void)
{
struct node
{
int a;
int b;
int c;
};
struct node s = { 3, 5, 6 };
struct node *pt = &s;


printf("%d\n", *(int*)pt);


return 0;
}
What is the output of this program?


(a) 3
(b) 5
(c) 6
(d) 7




3. Consider the following code segment:


int foo(int x, int n)
{
int val = 1;


if (n > 0)
{
if (n % 2 == 1)
val *= x;


val *= foo(x * x, n / 2);
}
return val;
}
What function of x and n is computed by foo?


(a) xn
(b) x × n
(c) nx
(d) none of the above






4. Consider the following program:


#include <stdio.h>


int main(void)
{
int a[5] = { 1, 2, 3, 4, 5 };
int *ptr = (int*)(&a + 1);


printf("%d %d\n", *(a + 1), *(ptr - 1));


return 0;
}
What is the output of this program?


(a) 2 2
(b) 2 1
(c) 2 5
(d) none of the above






5. Consider the following program:


#include <stdio.h>


void foo(int[][3]);


int main(void)
{
int a[3][3] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };


foo(a);
printf("%d\n", a[2][1]);


return 0;
}


void foo(int b[][3])
{
++b;
b[1][1] = 9;
}
What is the output of this program?


(a) 8
(b) 9
(c) 7
(d) none of the above




6. Consider the following program:


#include <stdio.h>


int main(void)
{
int a, b, c, d;
a = 3;
b = 5;
c = a, b;
d = (a, b);


printf("c=%d ", c);
printf("d=%d\n", d);


return 0;
}
What is the output of this program?


(a) c=3 d=3
(b) c=5 d=3
(c) c=3 d=5
(d) c=5 d=5






7. Consider the following program:


#include <stdio.h>


int main(void)
{
int a[][3] = {1, 2, 3, 4, 5, 6};
int (*ptr)[3] = a;


printf("%d %d ", (*ptr)[1], (*ptr)[2]);


++ptr;
printf("%d %d\n", (*ptr)[1], (*ptr)[2]);


return 0;
}
What is the output of this program?


(a) 2 3 5 6
(b) 2 3 4 5
(c) 4 5 0 0
(d) none of the above






8. Consider the following code segment:


#include <stdlib.h>


int *f1(void)
{
int x = 10;
return &x;
}


int *f2(void)
{
int *ptr;
*ptr = 10;
return ptr;
}


int *f3(void)
{
int *ptr;
ptr = malloc(sizeof *ptr);
return ptr;
}
Which of these functions uses pointers incorrectly?


(a) f3 only
(b) f1 and f3
(c) f1 and f2
(d) f1, f2, and f3




9. Consider the following program:


#include <stdio.h>


int main(void)
{
int i = 3;
int j;


j = sizeof(++i + ++i);


printf("i=%d j=%d\n", i, j);


return 0;
}
What is the output of this program on an implementation where int occupies 2 bytes?


(a) i=4 j=2
(b) i=3 j=2
(c) i=5 j=2
(d) the behavior is undefined




10. Consider the following program:


#include <stdio.h>


void f1(int*, int);
void f2(int*, int);
void (*p[2])(int*, int);


int main(void)
{
int a = 3;
int b = 5;


p[0] = f1;
p[1] = f2;


p[0](&a, b);
printf("%d %d ", a, b);


p[1](&a, b);
printf("%d %d\n", a, b);


return 0;
}


void f1(int *p, int q)
{
int tmp = *p;
*p = q;
q = tmp;
}


void f2(int *p, int q)
{
int tmp = *p;
*p = q;
q = tmp;
}
What is the output of this program?


(a) 5 5 5 5
(b) 3 5 3 5
(c) 5 3 3 5
(d) none of the above






11. Consider the following program:


#include <stdio.h>


void e(int);


int main(void)
{
int a = 3;
e(a);


putchar('\n');
return 0;
}


void e(int n)
{
if (n > 0)
{
e(--n);
printf("%d ", n);
e(--n);
}
}
What is the output of this program?


(a) 0 1 2 0
(b) 0 1 2 1
(c) 1 2 0 1
(d) 0 2 1 1






12. Consider the following code segment:


typedef int (*test)(float*, float*);
test tmp;
What is the type of tmp?


(a) function taking two pointer-to-float arguments and returning pointer to int
(b) pointer to int
(c) pointer to function taking two pointer-to-float arguments and returning int
(d) none of the above






13. Consider the following program:


#include <stdio.h>


int main(void)
{
char p;
char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8};


p = (buf + 1)[5];
printf("%d\n", p);


return 0;
}
What is the output of this program?


(a) 5
(b) 6
(c) 9
(d) none of the above






14. Consider the following program:


#include <stdio.h>


void f(char**);


int main(void)
{
char *argv[] = { "ab", "cd", "ef", "gh", "ij", "kl" };
f(argv);


return 0;
}


void f(char **p)
{
char *t;


t = (p += sizeof(int))[-1];


printf("%s\n", t);
}
What is the output of this program on an implementation where int and all pointer types occupy 2 bytes?


(a) ab
(b) cd
(c) ef
(d) gh






15. Consider the following program:


#include <stdarg.h>
#include <stdio.h>


int ripple(int n, ...)
{
int i, j, k;
va_list p;


k = 0;
j = 1;
va_start(p, n);


for (; j < n; ++j)
{
i = va_arg(p, int);
for (; i; i &= i - 1)
++k;
}
va_end(p);
return k;
}


int main(void)
{
printf("%d\n", ripple(3, 5, 7));
return 0;
}
What is the output of this program?


(a) 7
(b) 6
(c) 5
(d) 3






16. Consider the following program:


#include <stdio.h>


int counter(int i)
{
static int count = 0;
count = count + i;
return count;
}


int main(void)
{
int i, j;


for (i = 0; i <= 5; i++)
j = counter(i);


printf("%d\n", j);
return 0;
}
What is the output of this program?


(a) 10
(b) 15
(c) 6
(d) 7