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Program Crash
When can it happen that before calling main function itself program gets crashed?
ajrobb
- Sep 22nd, 2010
I agree.However, there is a difference between global and static. Global objects have global linkage and can be referenced anywhere in the program. Static objects can have access restricted to the file or function where they are defined.
THenry
- Sep 8th, 2010
All global static objects will be created before main().Program has problem to instantiate them.
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Memory Allocation
Why is it suggested not to use malloc() or calloc() in C++ for memory allocation?
ajrobb
- Sep 22nd, 2010
There may be a clash between malloc() and new as they don't HAVE to use the same heap library routines. Also, for arrays of classe objects, new invokes the default constructor. For single class objects new allows you to choose a different constructor.
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Pointers Datatype
What is the datatype of pointer?
jbode
- Nov 19th, 2011
There is no single "pointer" data type; you have many pointer data types. A pointer to int may have a different size and representation from a pointer to char, which may have a different size and rep...
niharricky27
- Oct 10th, 2010
Pointer datatypes are actually the datatype of the variables whose address the pointer is going to store or point to.i.e. to point an integer value, the pointer should of the same datatype i.e. int type.
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Operators
In the following code fragment, which is the calling object for the less-than operator?string s1, s2;if( s1 < s2 )Choose one answer. a. s1 b. < c. s2 d. none
bhatiapy
- Nov 25th, 2010
S1 is the calling object. The compiler converts s1<s2 to below function call :- s1.operator<(s2);
a_soni
- Nov 19th, 2010
S1. As this is the object which appears on the left side of the operator, this is the calling object for it. Whereas S2 is the object which is passed as an parameter to the '<' operator function.
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Classes
What error is caused by the following code ?class TemperatureList { public: TemperatureList( ); private: double * list; int size;};void func(Money amount);[...]int main{ TemperatureList list1; func(list1); return 0;}Choose one answer. a. double free b. divide by zero c. illegal argument d. no error
amithere007
- May 26th, 2011
The function func is taking an object of Money class which is not defined in this scope so that will give a compilation error. It will give the error as "Money' was not declared in this scope ".
wlochaty
- Jan 19th, 2011
c. illegal argument list1 object passed to a func() is diferent type than the func() param should be.func() expects an object of Money type.
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Copy Constructor
Explain what is copy constructor and what is the difference between copy constructor and overloaded assignment operator
amitmanish
- Mar 4th, 2011
Copy contructor is parameterised constructor with a argument which is a reference to an object of the class. Why we need a reference? the answer is that if we don't use a reference and instead u...
manas111
- Jan 13th, 2011
Constructor having reference type parameter;It is used to declare & initialise an object from another object.
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You have an array having numbers 1 to 100 but one number is missing? find out the missing number?
harshitha
- Feb 7th, 2014
Calculate the sum of 1 to 100 i.e sum=(1+100)*(100/2)=5050
Code- span style="color: #ff0000;">"missing number is %d
- ",temp);
- getch();
- }
std.approach
- Jun 4th, 2013
Its simple.
1. do calculate the sum of numbers from 1 till 100. is about (1+100)*(100/2)=5050
2. iterate and summarize all elements of container (array).
3. each number is unique in the container, so the difference between 5050 and the sum (from point 2) gives us an answer. -
Which of the following operators can not be overloaded
A) == b)++ c)?! d)
ProgrmmingBOT
- Nov 21st, 2011
?:(ternary operator) , .(dot operator), :: (scope resolution operator), sizeof operator and conditional operators.
maddy
- Nov 19th, 2011
++ ?!
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Inline functions advantages
What is the inline function and what is the use of inline function?
Paul_Singh
- Feb 7th, 2012
The inline keyword is a request to the compiler that you want the function body to be inserted into the compiled code as opposed to a function call. Typically used for functions that are called very o...
Amit
- Jan 6th, 2012
Inline function: they are same as Normal function but compiler treat them diffrently. When we call a inline function compiler will replace the call by inline function body (It depends upon how you hav...
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What do you understand by complexity?
robertgbjones
- Aug 5th, 2014
As asked of course it just means how complex or complicated a piece of software is, but generally the term refers to the big-O performance of an algorithm. So for example, searching a string for a cha...
Subrata Laha
- Jul 25th, 2014
Programming complexity (or software complexity) is a term that encompasses numerous properties of a piece of software, all of which affect internal interactions.
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C++ conversion program
How can I write a program that convert a given number of millimeters into the equivalent length in meters and meters into the equivalent length in millimeters?Also draw flowchart,algorithm,output.
Binary
Write a program that continues to ask the user to enter any decimal number and calculate it’s binary,octal and hexadecimal equivalent.
C++ Macros Functionality
What is the main thing that C++ macros can do that cannot be done with functions? Give a realistically useful example of something of this kind.
Macros have the distinct advantage of being more efficient than functions, because their corresponding code is inserted directly into your source code at the point where the macro is called. There is no overhead involved in using a macro like...Constructor Use
Why the constructor is used?
What is a template?
Templates allow to create generic functions that admit any data type as parameters and return value without having to overload the function with all the possible data types. Until certain point they fulfill the functionality of a macro. Its prototype is any of the two following ones: template identifier> function_declaration; template identifier> function_declaration; The only difference between...
MCBod
- Mar 31st, 2010
A template is a function that is defined without template parameters, being parameters that have an undefined type. The logic of the function must be executable for all possible data types e.g. using ...
rajangidwani
- Jul 20th, 2009
A template parameter is a special kind of parameter that can be used to pass a type as argument: just like regular function parameters can be used to pass values to a function, template parameters all...
What is namespace?
Namespaces allow us to group a set of global classes, objects and/or functions under a name. To say it somehow, they serve to split the global scope in sub-scopes known as namespaces. The form to use namespaces is: namespace identifier { namespace-body }Where identifier is any valid identifier and namespace-body is the set of classes, objects and functions that are included...
burraganesh
- Dec 7th, 2008
Namespace is simply a name given to a global space, to form a sub-space in global space.
saroj
- Oct 31st, 2007
Minimize?name collision in the global name space, this? namespace?keyword assining a distinict?name?to a libray?to use?the same indentifier names without creating any name collision further name more the? compiler uses the namespce signature for differenting the defn.
What is the difference between get and getline ?
mysterysource
- May 31st, 2015
If i am not wrong get() reads char by char and it does not read the blank spaces
anabarai
- Jul 4th, 2011
get() extracts char by char from a stream and returns its value (casted to an integer) whereas getline() is used to get a line from a file line by line. Normally getline is used to filter out delimite...
How copy constructor works?
sachin_mundhra
- Jan 28th, 2010
Copy Constructor :- This is among one of the default method of class.Base a;Base b = a ; // Here Copy constructor gets called.Here a new instance of class Base will be created and object a data will be copied in object b.Sachin Mundhra
Raju
- Mar 20th, 2007
Copy Constructor uses class name as reference .., it is used to declare and Initialize an object from another object. i.e It is used to create a new object from existing object of same class.
What is proper and improper inheritance? Explain with an example?
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Editorial / Best Answer
michaelpyles- Member Since Dec-2007 | Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal.
Improper inheritance occurs when a class is inherited from merely for code reuse, without having any other relationship. Example Cat Inherits from Engine. A Cat is not an engine however both an engine and a cat purr.yzesong
- Jul 31st, 2009
As long as no diamond problems (improper inheritance), single or multiple inheritance can all be proper inheritance. When usng multiple inheritance with diamond problem, you can use virtual inheritance to make the multiple inheritance a proper one.
michaelpyles
- Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal. Improper inheritance occurs when a class is inherited from merely f...
Can you explain the term "resource acquisition is initialization?"
sonal kumar
- Oct 12th, 2010
Resource Acquisition is Initialisation or shortly RAII is a term closely connected with exception handling and automatic garbage collection(speaking loosely). RAII is defined as the technique of per...
vidhudatta
- Sep 23rd, 2009
It is the technique of performing all the necessary resource allocation in constructor only and all the cleanind in the destructor.
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