-
Virtual Method
Base class has some virtual method and derived class has a method with the same name. if we initialize the base class pointer with derived object, calling of that virtual method will result in which method being called?
PUSHPANKAR
- Mar 22nd, 2010
The base pointer is pointing towards the derived object therefore the derived object will be called
hydsarema
- Nov 25th, 2008
derived function is calledto demonstrate this is the foll program#include<iostream.h>#include<conio.h>class base { public: virtual void vfun() &nbs...
-
The operator for exponentiation isa.**b.^c.%
A
souravray_88
- Feb 6th, 2010
I think that C doesn't define any opeartor for exponential function. It rather provides us with a pow(number, number_to_the_power) function that helps us to do the exponential opearations.
Shashi
- Aug 18th, 2007
Unbelievably, there is no built-in exponentiation operator in C. Instead, there is a library function (pow) which carries out this operation.
-
Which expression always return true? Which always return false?
expression if (a=0) always return false expression if (a=1) always return true
Vikramojha
- Jan 31st, 2010
Here the question exactly means the statement which will always irrespective of any condition and the statement which will never execute, so here if we useif (1) it will always execute or will return true andthe statement if (0) will never execute or will always return false.
nsivaramprasad
- Nov 28th, 2005
Irrespective of the value of a variable a, a^a always return FALSE (0)!(a^a) always return TRUE (1)
-
What is the difference between NULL and NUL?
NULL is a macro defined in <stddef.h> for the null pointer. NUL is the name of the first character in the ASCII character set. It corresponds to a zero value. There’s no standard macro NUL in C, but some people like to define it. The digit 0 corresponds to a value of 80, decimal. Don’t confuse the digit 0 with the value of ‘’ (NUL)! NULL can be defined as ((void*)0), NUL as ‘’.
abhimanipal
- Jan 30th, 2010
When we have a pointer variable of the sortchar* pWe often want to initialize it to 0, to ensure it does not point anywhere. We do this bychar* p=0Many programmers do not feel comfortable with the fac...
-
}
">Vii)7. main(){ int i=-1,j=-1,k=0,l=2,m; m=i++&&j++&&k++||l++; printf("%d %d %d %d %d",i,j,k,l,m);}
0 0 1 3 1Explanation :Logical operations always give a result of 1 or 0 . And also the logical AND (&&) operator has higher priority over the logical OR (||) operator. So the expression ‘i++ && j++ && k++’ is executed first. The result of this expression is 0 (-1 && -1 && 0 = 0). Now the expression is 0 || 2 which evaluates to 1 (because OR operator always gives 1 except for ‘0 || 0’ combination-...
abhimanipal
- Jan 30th, 2010
Although the answer posted above is correct. There is one mistake in the explanation. Beena says that && operator has higher precedence tha || operator so && is evaluated first. But in...
-
How do you redirect a standard stream?
Most operating systems, including DOS, provide a means to redirect program input and output to and from different devices. This means that rather than your program output (stdout) going to the screen; it can be redirected to a file or printer port. Similarly, your program’s input (stdin) can come from a file rather than the keyboard. In DOS, this task is accomplished using the redirection characters,...
jintojos
- Jun 9th, 2008
By using the operators "" we can redirect the standard input and out streams.example : d:> jinto.exe > outputredirected d:> jinto.exe < inputredirected
-
When would you use a pointer to a function?
Pointers to functions are interesting when you pass them to other functions. A function that takes function pointers says, in effect, “Part of what I do can be customized. Give me a pointer to a function, and I’ll call it when that part of the job needs to be done. That function can do its part for me.” This is known as a “callback.” It’s used a lot in graphical user interface libraries, in which...
abhimanipal
- Jan 30th, 2010
Another application could be when the function is not located in the code segment. Many time the size of the Source code is greater than 64 KB. In such a scenario if we want to call a function, we have to use a far pointer to call that function. Not sure though
-
How do you print only part of a string?
/* Use printf() to print the first 11 characters of source_str. */ printf(“First 11 characters: ‘%11.11s’n”, source_str);
abhimanipal
- Aug 21st, 2009
You can also print it using pointers....Try this following code segment ... This does the trick. char str[]="The Sky is Blue and so are you";char *s1= &str[5];printf("%sn",s1);
-
How can type-insensitive macros be created?
A type-insensitive macro is a macro that performs the same basic operation on different data types. This task can be accomplished by using the concatenation operator to create a call to a type-sensitive function based on the parameter passed to the macro. The following program provides an example: #include <stdio.h> #define SORT(data_type) sort_ ## data_type void sort_int(int** i); void sort_long(long**...
abhimanipal
- Jan 30th, 2010
There is small bug in the above programWhen the macro is define it is written as SORT, but when it is used it is written as sortThis will give an error
-
printf("%d, %d ", j++ , ++i);
}
">Main(){ int i =10, j = 20; clrscr(); printf("%d, %d, ", j-- , --i); printf("%d, %d ", j++ , ++i);}
A) 20, 9, 19, 10B) 20, 9, 20, 10C) 20, 10, 20, 10D) 19, 9, 20, 10
abhimanipal
- Jan 28th, 2010
The O/P in this question is not compiler dependant. The language specification of C clearly states that the arguments to the function are supposed to be passed from right to left. So irrespective of the compiler there should be only 1 answer20, 9, 19, 10
sittoop
- Feb 26th, 2009
This is supposed to be same in both C and C++. According to ISO ANSII standard the answer to this is "undefined".
-
}
}
">Main(){ signed int bit=512, mBit; { mBit = ~bit; bit = bit & ~bit ; printf("%d %d", bit, mBit); }}
A) 0, -513B) 512, 0C) 0, 513D) 0, 0
abhimanipal
- Jan 28th, 2010
Answer is A. This is how I reason it outmBit contains the inverse of bit. All the 1's in bit become 0 and all the 0's in bit become 1. 512 is positive so the result of this inverse has to be a -ve num...
louis
- Mar 29th, 2006
Two's complement:00000000000000001111111111111111 "Not operation" ->11111111111111110000000000000000 assign to int, since highest position is 1, then Not operation again, ->10000000000000001111111111111111, then plus 1->10000000000000010000000000000000, it is - 513
-
If the following program (myprog) is run from the command line as myprog 1 2 3, What would be the output? main(int argc, char *argv[]) { int i,j=0; for(i=0;i<argc;i++) j=j+ atoi(argv[i]); printf("%d",j); }
A) 1 2 3B) 6C) errorD) "123"
vanavill
- Mar 7th, 2008
initially J=0,then, it incremented by the arg value one. now it is 1.then it incremented by the arg&nb...
-
printf(" %d", sizeof(u.a));
// printf("%d", sizeof(u.a[4].i));
}
">Union u{ union u { int i; int j; }a[10]; int b[10];}u;main(){ printf("n%d", sizeof(u)); printf(" %d", sizeof(u.a));// printf("%d", sizeof(u.a[4].i));}
A) None of the AboveB) 1, 100, 1C) 40, 4, 4D) 4, 4, 4Explanation: 20, 200, error for 3rd printf
abhimanipal
- Jan 24th, 2010
If I uncomment the third printf I get the following errorpollux {~} > gcc test.c -o testtest.c: In function `main':test.c:21: error: union has no member named `i'pollux {~} >This is on linux machine with gcc compiler. Can anyone explain the reason for this ?
-
What are storage class in c
abhimanipal
- Jan 24th, 2010
I do not think volatile is a storage class. Volatile is a instruction given to the compiler not to optimize this variable.
Mahananda R.Biradar
- May 12th, 2006
Actually there are only two storage Classe........its given in K & R
-
Given the values of two nodes in a *binary search tree*, write a cprogram to find the lowest common ancestor. You may assume that bothvalues already exist in the tree.The function prototype is as follows:int FindLowestCommonAncestor(node* root,int value1,int value) 20 / 8 22 / 4 12 / 10 14I/P : 4 and 14O/P : 8(Here the common ancestors of 4 and 14, are {8,20}. Of {8,20}, the lowest one is 8).
One of the solution can be to find out postorder traversal taking each node one by one. This postorder function should return true if both the values (v1 & v2) are found in the postorder traversal of the given node. NOTE: The given tree is a BST.... think over it......
abhimanipal
- Jan 19th, 2010
The basic idea can be outlined as below:Start with the root. There can be 3 cases.1. Both the given nodes are to the left of the root. Then go one level lower on the left side2. Both the given nodes a...
-
Write any small program that will compile in "C" but not in "C++"
vipin gupta
- Aug 3rd, 2007
The following program compiles with 'C' with a warning about return type of main. But it wouldn't compile with 'C++', it gives error there:void main(){return;}
-
What do you mean by preprocessor directory
abhimanipal
- Jan 17th, 2010
I think the question should be what is a pre processor directive ?As of my knowledge there is no such thing as pre processor directory
purankkoul
- Apr 16th, 2008
I think it is the directory where header files are keptin turbo c it is include folderpuran
-
Write a program to check if the number is palindrome or not using recursive function.
md faiz iqbal faiz
- Jan 15th, 2010
main{ int sum = 0,n,n1,r; printf(" enter the number to be tested for palimdromen" ); scan("%d",&n); n1=n; while(r!=0) {r=n%...
baseersd
- Jul 24th, 2007
Here is the code for palindrome with recursive mechanism#include<stdio.h>int rev=0; //Global Variableint REV(int num){if(num>0){ rev=(rev*10)+ (num %10); REV(num / 10); //calli...
-
You have a link list. How can you tell whether there is a cycling in it?
santhigkinterview
- Jan 16th, 2008
Take 2 pointer. increment 1 pointer once and another pointer twice. keep incrementing unless pointer2 is NULL or when pointer 1 and pointer 2 are equal. When...
-
Execute Shell Command
How will you execute shell command without using system command in C-language? Write a program to execute ls -l and redirect the output to a file, without using system command ?
nicety123
- Dec 20th, 2009
#include <unistd.h>int ret;...ret = execl ("/bin/ls", "ls", "-1", (char *)0);
phanirvcse
- Apr 1st, 2009
You can use exec family of system calls to get the job done. Its a nice experience, go ahead and explore it.
C Interview Questions
Ans