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This is not a school assignment but questions from recruitment papers

thanx

Which is the only operator in C++ which can be overloaded but NOT inherited

This is an excerpt from an e-book


char *someFun()
{
char *temp = “string constant";
return temp;
}
int main()
{

I have searched the forum and found that volatile keyword is used so that other programs are allowed to modify it.

Then why is it provided in dos programming which does not support...

But why this is illegal


int gr8;
cout<<gr##8;

I have found from an ebook that we can maintain links between hetrogenous elements by void pointer.But then how we will be able to derefrence it since, derefrencing void pointer is illegal and also...

Thanks grumpy

I read this output question from a site

#include<iostream>
#include<conio.h>
#define f(g,g2) g##g2

using namespace std;
int main()
{
int var12=100;

Can We write something to beginning of a file?

How to reverse a text file character by character that is last character of file must be first character of output file.

Though I did it by taking the text of whole file in character array and...

Wow! There is no reply.Ok I have found it myself


cmd = New OleDbCommand("select * from titles where title_id=('@a') ", con);


The real culprit is single quotes in '@a'.Instead of...

I just want user to select something from combobox and then whole row corresponding to that value should get displayed in datagrid. I am getting table but not getting any data in it.



cmd =...

If you want to do this by char pointer then allocate the required memory through new operator.



char *a=new char[20];
cin>>a;
cout<<a;


But be sure you don't enter more than 19 word...

You can't do it on Dev C++.Turbo C++ provides a very nice graphics.h header for this

Posted by Mario.F
Which means they are both 4 bytes long
or 32 Bits (1 byte equals 8 bits), also known as word


No,one word is equal to 2 bytes

Why Dos is called 16 bit
Perhaps because it has 16 bit(2 bytes) pointers.

Then Win XP should have 64 bit (8 bytes) pointers

Oh! Now I have realised that


vector<int> a[10];

is actually a array of pointer pointing to 10 vectors of size 0.

Here is proof

vector<int> arr[3], is an array of 3 vectors (vectors of integers)


Array of 3 vector?
Can you elaborate on this

if


vector<int> a[10];

is an array then why I am not able to use it like


a[2]=10;

Wow now,that's work
But what's the difference between



vector<int> a[10]; //Even other functions like size and push_back does not seem to work
//and
vector<int> a(10);

Why




vector<int> a[10];
cout<<a[2];//Valid
cin>>a[2];//Invalide

I have recently learnt vectors. Where one should use array and where vector. Is it possible to have 2D,3D...,ND vectors. What is vector equivalent of apart from using iterators.



int a[10];...

Ok,It was just my luck that I got garbage value as 0. I have tried several times but you will not always get it as zero.

Do you know any compiler which does not do so???