An array is a collection of elements of similar data type whereas the pointer is a variable that stores the address of another variable. An array size decides the number of variables it can store whereas; a pointer variable can store the address of only one variable in it.
What is difference between array and pointer in C?
What is the difference between array of pointer and pointer to array?
What is the relation between array and pointer?
What is array and pointer example?
Why are references used in C++?
The main use of references is acting as function formal parameters to support pass-by-reference. In an reference variable is passed into a function, the function works on the original copy (instead of a clone copy in pass-by-value).
What is default data type in C?
char: The most basic data type in C. It stores a single character and requires a single byte of memory in almost all compilers.
What is call by value call by reference in C language?
Call by value: A copy of the variable is passed to the function. Call by reference: An address of the variable is passed to the function.
What is the difference between character array and string?
String is implemented to store sequence of characters and to be represented as a single data type and single entity. Character Array on the other hand is a sequential collection of data type char where each element is a separate entity. String internal implementation makes it immutable in nature.
How do you create a pointer object in C++?
A pointer to a C++ class is done exactly the same way as a pointer to a structure and to access members of a pointer to a class you use the member access operator -> operator, just as you do with pointers to structures. Also as with all pointers, you must initialize the pointer before using it.
What is data type in C?
In C programming, data types are declarations for variables. This determines the type and size of data associated with variables. For example, int myVar; Here, myVar is a variable of int (integer) type.
How do you type cast in C++?
Typecasting is making a variable of one type, such as an int, act like another type, a char, for one single operation. To typecast something, simply put the type of variable you want the actual variable to act as inside parentheses in front of the actual variable. (char)a will make ‘a’ function as a char.
What is a object C++?
An Object is an instance of a Class. When a class is defined, no memory is allocated but when it is instantiated (i.e. an object is created) memory is allocated. Defining Class and Declaring Objects. A class is defined in C++ using keyword class followed by the name of class.
What is data modifier?
Data type modifiers are used with the Double and Character data types only to modify the length of data that a Double or Character data type can hold. Data type modifiers are used with the Float and Double data types only to modify the length of data that a Float or Double data type can hold.
What are the different data types present in C++?
- Integer.
- Character.
- Boolean.
- Floating Point.
- Double Floating Point.
- Valueless or Void.
- Wide Character.
- Integer.
- Character.
- Boolean.
- Floating Point.
- Double Floating Point.
- Valueless or Void.
- Wide Character.
What is an inline function in C++?
Inline function in C++ is an enhancement feature that improves the execution time and speed of the program. The main advantage of inline functions is that you can use them with C++ classes as well.
What is static variable in C?
Static variables are initialized only once. The compiler persists with the variable till the end of the program. Static variables can be defined inside or outside the function. They are local to the block. The default value of static variables is zero.
How do you reverse a string in Java?
- public class StringFormatter {
- public static String reverseString(String str){
- StringBuilder sb=new StringBuilder(str);
- sb.reverse();
- return sb.toString();
- }
- }
- public class StringFormatter {
- public static String reverseString(String str){
- StringBuilder sb=new StringBuilder(str);
- sb.reverse();
- return sb.toString();
- }
- }
What is the use of toCharArray method in Java?
The java string toCharArray() method converts the given string into a sequence of characters. The returned array length is equal to the length of the string. Syntax : public char[] toCharArray() Return : It returns a newly allocated character array.
How do you define a virtual function in C++?
A virtual function is a member function in the base class that we expect to redefine in derived classes. Basically, a virtual function is used in the base class in order to ensure that the function is overridden. This especially applies to cases where a pointer of base class points to an object of a derived class.
How do you write to a file in C++?
- include the fstream header file and using std::ostream;
- declare a variable of type ofstream.
- open the file.
- check for an open file error.
- use the file.
- close the file when access is no longer needed (optional, but a good practice)
- include the fstream header file and using std::ostream;
- declare a variable of type ofstream.
- open the file.
- check for an open file error.
- use the file.
- close the file when access is no longer needed (optional, but a good practice)