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

Recursion, #questiowrite a program to calculate e^x

#questiowrite a program to calculate e^x

COMPUTER, THEORY OF A COMPUTER PROGRAMMING

THEORY OF A COMPUTER PROGRAMMING

Program to calculate the average sales for each employee , There are 2...

There are 25 employees in a business. Each employee has 5 sales each day of the month (Assume there are 30 days in each month of the year). Draw a flowchart for a pr

Decodethecode.h, decodes the sending smuggler string from the number format...

decodes the sending smuggler string from the number format into plain text

C program to print character array, Program to print character array : ...

Program to print character array : Write a program to print the character array by using string class functions. void main() {  char line[30];   int i=0;   clrsc

Minimum shelf, At a shop of marbles, packs of marbles are prepared. Packets...

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets with thes

Describe "this" pointer?, It is a pointer accessible only in the member fun...

It is a pointer accessible only in the member functions of a struct, class or union type. It points to the object for which the member function is called. Static member functions d

Abstract array - c program, Abstract array - c program: AbstractArray:...

Abstract array - c program: AbstractArray::AbstractArray( int anUpper, int aLower, sizeType aDelta ) {     PRECONDITION( anUpper >= aLower );     lastElementIndex = a

Overloading unary operators using friend function, O v e r l o a d i ...

O v e r l o a d i n g U n a r y Op e r a t o r s Us i n g F r i e n d F u n c t i o n cl a ss s i g n { i n t a ,

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