Arrays
1. What is the output
# include <stdio.h>
int main ()
{
int a[] = { 0001, 0010,
0100, 01000 };
int i;
for ( i = 0 ; i < 4 ; i++)
printf("%o\t", a[i]);
return 0;
}
a)
1 10 100 1000 b)
1 8 64 512
c)
Compiler Error d) None
2. What is the output
#include<stdio.h>
int main()
{
float arr[] = {12.4, 2.3, 4.5, 6.7};
printf("%d\n", sizeof(arr)/sizeof(arr[0]));
return 0;
}
a) 6 b)
5
c) 4 d)
None
3. What is the output
#include<stdio.h>
int main()
{
int arr[] = {12, 13, 14,
15, 16};
printf("%d\n", sizeof(arr)/sizeof(arr[0]));
return 0;
}
a)
6 b)
5
c) 4 d)
None
4. What is the output
#include<stdio.h>
int main()
{
char
*m[]={"jan","feb","mar"};
char
d[][10]={"sun","mon","tue"};
printf("%s\t",m[1]);
printf("%s\n",d[1]);
return 0;
}
a) feb mon b)
Compile time error
c) Run
time error d)
jan sun
5. #include<stdio.h>
#include<stdio.h>
int main(void)
{
int a[2]; a[1] = 3;
printf("a[1] =
%d",a[1]);
printf("1[a] =
%d",1[a]);
return 0;
}
a) Compile
Time Error b) 1 1
c) 3 3 d)
Garbage Value
6. What is the output?
#include<stdio.h>
int main()
{
static a[3]={1};
int b[3]={1};
printf("%d %d",a[2],b[2]);
}
a) 0 0 b) 1 1
c) Compiler Error d)
None
7. What will be the
output?
#include <stdio.h>
void
size(int arr[10])
{
printf("%d\t",
sizeof(arr));
}
int main()
{
int
arr[10];
size(arr);
printf("%d\n", sizeof(arr));
return
0;
}
a)
10 10 b)
Compiler Error
c) Runtime Error d) 4 10None
10. array[]
= str[] is it possible if not what error it will give.
11. Array
vs pointer
12. Array
vs structure
structure padding, packing
indexing in array
array elements accessing for loop, struct directly
13. *a[]
-> what is this?
14. Convert
a[i][j][k] in terms of pointers.
15. You
have two arrays declared as int a[10],b[10];
if you assign a=b
what is the error and how can we overcome it?
16. int
a[]={4};
int b[] = { 1, 2, 3, 4}
printf("%d %d ",
sizeof(a), sizeof(b));
17. int a[]
= { 1, 2, 3, 4};
int *p = (&a + 1) ;
printf ("ans = %d " , *(a
+ 1), *(p - 1) );
19. Given
an array of 100 integers.Find the greatest among them
without using > , < than
operators.
20. How to
pass entire array to a function as call by value?
22. char *s = "char *s =
%c%s%c;main(){printf(s,34,s,34);}";
main(){printf(s,34,s,34);}
Answer : Prints its own code
23. About the arrays bound checking.
24. What is the difference between the pointer and array,
which one is more advantages.
25. What is smart pointer?
27. When does the compiler not implicitly generate the address of
the first element of an array?
Whenever an array name appears in an expression such as
- array as an operand of the sizeof operator
- array as an operand of & operator
- array as a string literal initializer for a character array
Then the compiler does not implicitly generate the address of the address of the first element of an array.
- array as an operand of the sizeof operator
- array as an operand of & operator
- array as a string literal initializer for a character array
Then the compiler does not implicitly generate the address of the address of the first element of an array.
28. What
are the characteristics of arrays in C?
31. What is
the difference between a string and an array?
32.Is it
better to use a pointer to navigate an array of values,or is it better to use a
subscripted array name?
33. Can the
sizeof operator be used to tell the size of an array passed to a function?
34.
Represent two dimentional array using pointer.
35. array[]
= str[] is it possible if not what error it will give.
36. Find if
there is any problem(s) in the code below:
int main()
{
int a[] = {1,2};
int *p = malloc(sizeof(int));
p[1] = 3;
p = a;
a = p;
}
37. Take an
array for example
a[] = {3, -2, -1, 5, -5,
2, -3, 4, 2, -2, -3}
While
traversing the above array, we need to find the last consecutive sume. In the
above example (4+2 = 6) will give the largest sum. The output should be
something like – a) largest sum b) the numbers taken to compute the same and b)
the respective start index and end index
38. In case of array what is the differnce between a and
&a. What is the output of below expressions. If both are same why they are
same? If not why?
a
+1 =?, &a + 1 = ?
39. WAP to delete a member from array.
40. Difference in array and linked list.
41. Difference between Static array and Dynamic array??
What is their significance?
42. I have byte array, I need to set a bit at position 500
?
43. I'm having array of 200 elements, the range of each
value is 1 to 100, Now you should print values only once, (you should not print
a value more than once).
44. int A[100];
int B[100];
write a function to find out which all numbers are
repeting?
47) array vs pointer
Pointers
1. Explain the type difference between the variables
declared as follows:
int (**p)[10];
int *(*q)[10];
2. What is the output:
int main( int argc , char **argv )
{
int k ;
for ( k =
0 ; k < argc ; k++)
printf( “%s”, argv[++k]);
}
In command Line
./executable 1 2 3 4
a) 2 4 b)
1 3
c) 1 2 3 4 d)
Compile time Error
3. int a[]={1,2,3,4,5} ;
int *ptr , **ptr1 ;
ptr = &a ; ptr1 = & ptr ;
How do you update a[2] to 10 using
ptr1?
a) *(ptr1+2) = 10 b) *(ptr1)+2 =
10
c) *(*ptr1+2) =10 d)
(**(ptr1) +2) =10
4. What is the output:
int main( )
{
int
k = 100 ;
const
int *p =&k ;
*p
= 200 ;
printf(“\n %d”, k );
}
a) Compiler Error b)
100
c)
200 d)
0
5. What is the Output
# include <stdio.h>
int main ()
{
int *ptr = NULL;
ptr++;
printf("%d \n", ptr);
return 0;
}
a) Segmentation Fault b) Compiler Error
c)
Runtime Error d)
4
6. What is the output:
const
int *p ;
int main( )
{
int k = 10 ;
p =&k ;
*p = 20 ;
printf(“\n %d”, k );
}
a) Compiler Error b) 10
c) 20 d)
Run Time Error
7. What is the Output
# include <stdio.h>
int main ()
{
int *ptr = 10;
int x = 15
printf("%d %d
\n", ptr+x, x + ptr);
return 0;
}
a) Runtime Error b)
Compiler Error
c)
70 70 d)
None of the Above
8. What is the Output
#include<stdio.h>
int main(void)
{
char *v[] =
{"abc","efg","jkl"};
char **p = v;
printf("%c\n",*++p[0]);
printf("%c\n",(*++p)[0]);
return 0;
}
a) a e b)
a f
c) b f d)
b e
9. What operation we cant do with pointers.
10. What is heap area?
11. Represent two dimentional array using
pointer.
12. *p() ->
what is this?
13. Which operation on pointer is not valid, if p
and q are two pointers fun (int *p,
int*q)
a) p + q
b) p * q
c) p / q
d) None of these.
Here all
the oprations are invalid . I Dont know whether it is wrong question or wrong
answer.
14. int *( *test) (char*)
---> what it represents;
15.for( i = 0 ; i < argc ; i++) {
printf(" %s" , argv[i] );
}
what is output - if
input is ./a.out *
Ans - prints lists of files in directory.
16. what is pointer?
17. Program to print command line arguments and
environment variables.
18. what does ptr++ and *ptr++ will do?
19. How to generate segmentation fault?
20. Why do we need pointers?
21. Can we return more than two values from a
function without using Pointers?
22. What are the advantages & disadvantages
of pointers?
23. Write a program equivalent to the below
program using pointers?
main() {
int x;
x = 5 * 2;
printf(“%d”, x);
}
main() {
int *x;
x = (int *)malloc(sizeof(int));
*x = 5 *2;
printf(“%d”, *x);
free(x);
}
24. Where do we use single pointers and double
pointers?
25. Diff between preincrement and post
increment in case of pointers?
26. Output?
int
a[] = {1,2,3,4,5};
p
= a;
pf(%d,*p++);
27. Explain
int * (*fun)(int (*a)[])
Answer : A function pointer which takes
argument as pointer to an integer array and returns integer pointer.
28. what is size of following..
int *a[10];
int (*fun)();
void *fun();
Answer : 40 4 1
29. What is the function pointer? explained
with an application.
30. How are pointer variables initialized?
31. Are pointers integers?
32. What is a pointer variable?
33. What is a pointer value and address?
34. When should a far pointer be used?
35. When would you use a pointer to a function?
36. How do you use a pointer to a function?
37. Can you add pointers together? Why would
you?
38. What does it mean when a pointer is used in
an if statement?
39. Is NULL always defined as 0?
40. What is a void pointer?
41. What is a null pointer?
42. How many levels of pointers can you have?
43. What is indirection?
44. int
main()
{
unsigned
char *c;
c
= 'A';
while
(c >= 0)
printf("%d\n",
(*c)++);
}
What
will be the output of above program?
45. Why dereferencing null pointer is
segmentaion fault?
46. Declare a structure variable is of pointer
type and allocate memory for that.
47. What happens to the pointer p for the
following code,
int
main()
{
int *p;
p = p+12;
}
48. Depict the usage of Function pointers.
49. void *p;
p = p+ 12;
What
happens to p pointer?
50. String reverse function?
51. What is the use of function pointer
(pointer to function)?
52. Char
*p = “abc”;
printf
(“%c”, *p++);
printf
(“%c”, ++*p);
printf
(“%c”, (*p)++);
53. char p [] = “abc”;
printf
(“%c”, (*p)++);
54. a) const int a = 10;
int
main ( )
{
int
*p = &a;
*p
= 5;
printf
( " %d", a);
}
b)
int main ()
{
int
a= 10 ;
*p
= &a;
(*p)++;
printf
( "%d", a) ;
}
Strings
1. Implement the following as recursive functions
a. To check whether the given string is palindrome
b. To reverse a given string
2. Search for keywords of C language in a source code and
report the frequency of each keyword. (Use enumerated data type in your
program)
3. Write a function
void written_amount ( unsigned int amount, char *buffer );
that converts the value in amount to words & stores
them in the buffer. This function might
be used in a program that prints checks. For example value 16312 the string
SIXTEEN THOUSAND THREE HUNDRED TWELVE
should be stored in the buffer.
4. The standard I/O library does not provide a mechanism
for putting commas in large integer when they are printed. Write a function that
provide this capability for rupees amount. The function will convert a string
digit to rupees as show below
Input : SIXTEEN THOUSAND THREE HUNDRED TWELVE
Output
: 16,312/-
Here is a
prototype for the function:
void
rupees ( char *buffer, unsigned int amount );
5. Implement the
following functions as library functions using ar: strncpy, strncat, strncmp,
strrchr, strspn, strcspn, strtok, strcasecmp, strstr, memcpy, memmove. (Hint:
Write separate .c file and then use ar to combine them into one library)
6. Implement the following functions as library function
using ar: isalnum, isalpha, isdigit, isprint, isupper, isxdigit, islower,
iscntrl
7. Implement the Q6 functions as macro.
8. What is the output of the following code? Justify your
answer.
#include<stdio.h>
int main()
{
char
*ptr="Hello"
"'\0'"
"world";
printf("%s",ptr);
}
9. char *s =
“Global”;
int main(void)
{
strcpy
(s, “Edge”);
return
0;
}
What is the output of the above code.
Justify ?
10. Inserting comma between words in line.
11. Convert integer into string and string into integer.
12. Arrange the
words in a file in Increasing and Alphabetical order
13. Remove the common word's, and print the remaining
word's and it presented line number's
14. Find the Output ?
int main() {
char *str = “Hello World”;
str[0] = 'h';
printf(“%s”, str);
}
Answer :Segmentation Fault
15. What is the Output
# include <stdio.h>
int main (void)
{
char *str =
"Globaledge";
*str = 'g';
printf("%s",
str);
return 0;
}
a) globaledge b) Globaledge
c)
Runtime Error d)
Compiler Error
16. What is the output of this.
#include<stdio.h>
#include<string.h>
int main()
{
char str[] =
"Global\0\Edge\0";
printf("%s\n",
str);
return 0;
}
a) Global Edge b) Edge
a) Global Edge b) Edge
c) Global d)
None
17. What
is the output of this?
#include<stdio.h>
int main()
{
char c='a';
char
*c_ptr=&c;
printf("%d & %d",
sizeof(char), sizeof c_ptr);
return 0;
}
18. #include <stdio.h>
#include
<string.h>
int
main ( )
{
char
*str=”Helloworld”;
printf(“%d
%d”, sizeof(str), strlen(str));
return
0;
}
a) 10 4 b) 4 10
c)
11 11 d)
10 10
19. What will be the output?
int main ( )
{
char
*src=”Helloworld” ;
char
*dst ;
while
( *dst++ = *src++) ;
printf(“%s”,
dst);
return
0;
}
a)
Helloworld b)
Compiler Error
c)
Runtime Error d)
No output
20. #include <stdio.h>
#include
<string.h>
int
main ( )
{
char
*str=”Hello\0world”;
printf(“%d
%d”, sizeof(str), strlen(str));
return
0;
}
a) 10 4 b) 4 10
c)
4 5 d)
5 4
21. What is the output
#include<stdio.h>
int main()
{
char src[] = "Hi";
char dest[] = "Hello";
dest = src;
printf("%s\n", src);
return 0;
}
a)
Hi b)
HelloHi
c)
Hello d)
None
22. Impliment Optimized strcpy.
23. Output?
int
main()
{
char
*str="hello";
char
*str1 ="world";
char
*p,*q;
p=&str;
q=&str1;
while(*str1++
= *p++)
;
while(*str1++
= *q++);
printf("%s"
star1);
}
25. char str[7]="ABC";
char
str2[4]="yxz" ;
char
*s, *t;
*s
= str; // wrong
*t
= str2; // wrong
while(*s)
s+;
while
(*s++=*t++) ;
printf("str
= %s", str);
Ans ---- IT is strcat function . But they are
assigning to *s , IT is not correct , we
have to assign to s only .. There is no answer like any Error .
So I marked - "ABCyxz" .
26. Write strcat and strcpy
fuctions.
27. Write a program
to get a string from the console and return to the calling function without
return value?
28. int main()
{
char *str="Sony is Japanese based company"
char *tmp;
tmp=str;
str=strstr(str,"Japanese ");
printf("%d %d\n",&tmp, &str);
strcat(tmp,str);
printf("%s",str);
}
29. How do you print only part of a string?
30. How can I convert a string to a number?
31. How can I convert a number to a string?
32. What is the difference between a string copy (strcpy)
and a memory copy (memcpy)? When should each be used?
33. Finding duplicate characters in a stream of characters.
35.Write a function to check whether the given string is
palindrome or not.
36. Find the output for the following code,
int
main()
{
char
*s = “Hello”;
s[0]
= 'h';
printf(“%s”,s);
return
0;
}
37.
Find the output of following code,
int
main()
{
char
s[10] = “abcde”;
int
a = 3;
printf(“%c”,s[a]);
printf(“%c”,a[s]);
}
38.
Find the output for the following,
int
main()
{
char
c ;
for(c
= 120; c <= 128; c++)
{
printf(“%d
”,c);
}
return
0;
}
39. Reverse the given string on the same string.
40. Why we can't change char *s="hello" this
value?
41. Write a program for string comparision?
42. int NoOftime(char *sentence,char *word),write function
it should return in a sentence how many time the given word is present?
sentence = tamiltamizh tamizh tamizh
word = tamizh
return 2
44. Int *ptr = malloc (100);
suppose we have writen upto 50 bytes in ptr, and we want to
remove remaining 50 bytes.
How you will do it and Write a function for the same.
45. what is the difference between strcpy and memcpy?
46. prm for strcpy and memcpy
47. memset int arr[100] to zero
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