Declaration of variables in cpp, C/C++ Programming

Assignment Help:

Declaration of Variables:

Variables are declared as follows:

int a;

float b;

 

Assigning value to variables:

int a = 100; Declaring and assigning is called initialization.

float b; Declaring a variable b.

b = 123.456; Assigning value to b.

int a=b=c;

 

Dynamic initialization of variables

int main ( )

{int a = strlen("apple");

cout<<"Total character in the string is"<

return 0;

}

Variables can be declared and initialized at the same time. int main ( )

{int a,b;

cin>>a>>b;

int c=a+b;

cout<<"c is" <

}

In C++  variables  can be declared  anywhere  in  the program  which  will  allow  to do dynamic initialization.  Remember for dynamic initialization the variables must be declared prior to dynamic initialization of new variable.

Reference Variable:

Syntax to define a reference variable is

datatype &reference_variable_name = variable_name;

int y;

int &x = y;

Now the value of x and y will be the same and also if any one of the value is changed the

change will be reflected in the other variable. y =10; Now x is also 10.

x = 20; Now y is also 20.

y = x + 10; Now x and y is 30.

 

Reference through pointer variable:

int x;

int *ptr = &x;

int &y = *ptr;  This is equivalent to int &y=x;

 

In function it is known as call by reference void f_ref(int &x)

{x = x +10;

}

int main ( )

{int m =10; f_ref(m); return 0;

}


Related Discussions:- Declaration of variables in cpp

C program for bernoulli''s equation, i need a detailed c program to explain...

i need a detailed c program to explain the parameters of bernoulli''s equation..

Project (network programming), Need help in network programming in C++ proj...

Need help in network programming in C++ project. How much you charge?

C program to search for a given character in a string, Program is to search...

Program is to search for a given character in a string: Program is to search for a given character in a string and print point of match char *stsearch(char *string, char sea

#decode the code, #Smugglers are becoming very smart day by day. Now they h...

#Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new techn

C++, 2. Write C++ code for calculating the time table

2. Write C++ code for calculating the time table

Explain string constants in c language - escape sequences, Explain string c...

Explain string constants in c language - Escape Sequences? Illustrations are "945", "hello", "well done", "5+3". The character constant (example 'x') isn't equivalent to the st

Operators and their expression in cpp, Operators in C++: All C operator...

Operators in C++: All C operators are valid operators in C++ also.  Besides C++ has developed some new operators like Operators and their Expression: 1.      Logical op

Explain the unary minus operator, Unary Minus Operator( Negation) This ...

Unary Minus Operator( Negation) This operand can be used to negate the value of a variable. It is also used to state a negative number, here a minus(-) sign is prefixed to the

Common concepts of object oriented, Object Oriented Programming Paradigm: ...

Object Oriented Programming Paradigm: For OOP, Paradigm is a standard set.  The OOP will help to develop software in modules, which will be integrated later as a full packag

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd