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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...
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Header File
Why should we use header file?
vigneshwaransankaran
- Sep 9th, 2009
#include<stdio.h> #include<conio.h> main() { int a,b,c,d; clrscr(); d=0; printf("enter a number"); scanf("%d",&a); c=a; while(a>0) b=a%10; d=d+(b*b*b...
rkanna
- Dec 22nd, 2008
for example...we should include the header file (Ex: #include<stdio.h>) before the main function. because if we are going to use following function in our program we should inclu...
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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.
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Null Pointers
What is the use of null pointers?
jbode
- Feb 1st, 2011
A null pointer represents a well-defined "nowhere", and is guaranteed to compare unequal to any other object or function pointer value. It's often used as a sentinel value to indic...
sriranga.ch
- Aug 31st, 2009
Usually in C. If are nor initialized any thing automatically some garbage information will be palced in variable. In pointers also same if we are not initialized with any variable address it will point to some memory. Avoid accessing of some other memory initialized with Null.
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Find Number of Occurrences
How will you find the number of occurrences of a particular string in the given input string?
kbjarnason
- Jul 1st, 2010
The question is insufficiently specified. For example: "Find the number of occurrences of NN in the string NNNNN"One answer would be 2 occurrences - the first NN pair, the second...
printfbabu
- Dec 29th, 2009
Int computeSubStrings(const char *string,const char *substr){ int count = 0; char *token = strstr(string,substr); while(token != NULL) { count++; token = strstr(token + 1,substr); } return count;}The above function can be used for counting no. of occurences of a substring in a string
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Pointer Variable
How to declare and initialize a pointer variable?
jbode
- Oct 6th, 2010
Argh, hit "Submit" before I was finished.For an array a of type T, the expression "&a" yields a pointer to an array of T:int a[5] = {1,2,3,4,5};int (*pa)[5] = &a;
jbode
- Oct 6th, 2010
For any type T:T *p; // declares p as a pointer to TT *ap[N]; // declares ap as an N-element array of pointer to TT (*pa)[...
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Convert int to string
Convert int to string without using itoa in C language
jbode
- Sep 20th, 2011
Oh for Pete's sake, what's the point of having an "insert code" option if it munges the code beyond all recognition? Seriously, for a site geared towards programming questions, the support for actually *posting code* is pretty poor.
jbode
- Sep 19th, 2011
Use sprintf. ALternately, you could do something like this (probably not the most efficient approach, but fairly straightforward: "c #define MAXDIGITS ... // maximum number of ...
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Read Specified Number of Elements
What function will read a specified number of elements from a file?
kiran.eemuru
- Aug 1st, 2012
Fread() function will read a specified number of elements from a file .
rocking.piyush
- Feb 22nd, 2011
Its the read() functionthe syntax isint bytes = (fp, buf,1);First argument is the source file, second argument is the address of the buffer and the third argument is the maximum number of bytes we want to read.It returns the number of bytes actually read.
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Function to find Occurrences
Write a function Occurrences() in a language of your choice that takes in two strings. The first is a search string, and the second is a sentence. For example, running the function:Running Occurrences ("o", "Red Gate Software - Ingeniously Simple Tools")will output: Occurrences of 'o': 4Occurrences ("at", "The cat sat on the mat")will output: Occurrences of 'at': 3charles.
shashank
- Nov 3rd, 2011
Code- span style="color: #ff0000;">"occurances = %d",occ("at","the cat sat on the mat"));
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the_code
- Aug 24th, 2011
Below is the code to do this in C language. Hope this helps."c #include #include int count_occurences(char *big, char *small) { char *temp; int count=0; temp=strstr(big,small)...
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Volatile Variables
Where does the variables with volatile keyword, gets stored??
vandana tyagi
- Sep 11th, 2011
It gets stored in RAM
ankitgujrati27
- Sep 1st, 2011
If we put volatile keyword before any data type then it tells to the compiler to store the value of the variable to the registers first then perform operations.
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Find directory from the file
A file containing the one million directories , then find the a directory from the file and print it in c language.
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How to write simple C Calender program ?
Should return the week of the date
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Print the output as follows by a c program without using loops?
print the output as follows by a c program without using loops?
1
1 2
1 2 3
1 2 3 4
1 2 3
1 2
1Sai Praveen Gampa
- Nov 1st, 2011
No need of three functions. Good thought to use Recursive. I have just divided that output as.. 1 1 2 1 2 3 1 2 3 4 1 2 3 1 2 1 Dont mind if you want the same output as you specified just remove pri...
jbode
- Oct 19th, 2011
This can easily be done with 3 recursive functions. The first function will print out a sequence from 1 to n: void printSeq1(int n) { if (n > 1) printSeq1(n - 1); printf("%d ", n); } The se...
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Print number of distinct characters in a string.
How do I implement a C program that reads a string and prints a table with the number of occurrences of each character in the string.
Ex: Rubber. r = 2, u = 1, b = 2, e = 1.shweta gupta
- Jun 25th, 2014
Code- span style="color: #ff0000;">"aabcadefge"
jbode
- Aug 31st, 2012
Simple, fairly brain-dead example. Assumes any input characters fall into the range [0...CHAR_MAX). "c #include #include #include int main(int argc, char **argv) { int coun...
C code explanation
struct marks
{
int p:3;
int c:3;
int m:2;
};
void main()
{
struct marks s={2,-6,5};
printf("%d%d%d",s.p,s.c,s.m);
}Why integer range -32768 to 32768
Why integer range -32768 to 32768 and actual meaning of storage size 2 bytes ?
jbode
- May 28th, 2012
[-32767,32767] is the minimum range for int, meaning a minimum size of 16 bits. Implementations may choose a wider size and range for integers.
That range covers most architectures, whether ones or twos complement.Varun Pratap Singh
- May 15th, 2012
In C language, int takes 2 bytes. Now 2 bytes mean 16 bits. One bit out of these 16 bits is for sign (+ or -) of integer. So, remaining 15 bits will store data in form of 0 and 1. The maximum value in...
A program in C using Void Pointer
c#include
#include
int main()
{
int a=10;
void *p;
p=&a;
clrscr();
printf("%u",*p);
getch();
return;
}
I know that this program is wrong as error is shown on compiling it.
Anyone please provide a simple program using Void pointer in C.
Thanks in advance :)Ashok Kumar Orupalli
- Sep 3rd, 2012
You have to typecast void pointer to int as *(int*)p;
Code- #include<stdio.h>
- #include<conio.h>
- "%u"
Sereche
- Jul 9th, 2012
Your error is on line 9, where youve attempted to dereference a pointer to void (the expression *p). You can only dereference typed pointers. The solution you are probably looking for would be to repl...
Accept two numbers from the user...
...and multiply these two numbers without using the multiplication operator!
using any loop!Delbin
- Jul 22nd, 2012
Code- #include<stdio.h>
- #include<stdlib.h>
- "%d%d""%d
- ",result);
- }
Er.Kunal
- Jul 22nd, 2012
I have included the code herein for u."c //Program for Multiplication without using multiplication operator written by Er.Kunal #include #include void main() { int multiplican...
Function syntax
string abc = showData()["Hello"];
can somebody explain what is use of ["Hello"] after function call?shweta gupta
- Jun 25th, 2014
There is showdata is returning index .
example when it return 1 then abc="ello";jbode
- Aug 6th, 2012
C doesn't have a String data type, unless that supposed to be a typedef for something. Having said that, I think this is taking advantage of the fact that array indexing in C is commutative; IOW, "...
Ans