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

Miniumshelf, write a prgm to find minimum total number of shelves including...

write a prgm to find minimum total number of shelves including the intial one required for loading process

Write a program to find files-unix, This programming assignment is for use ...

This programming assignment is for use in the LINUX/UNIX environment!! Introduction: System administration often requires custom written programs and tools. One problem a s

Define functions with arguments and return values, Define Functions with ar...

Define Functions with arguments and return values? The earlier category functions receive values from the calling function through arguments but do not send back any value rath

Program for basically a small store, ¦It should ask customers to enter deta...

¦It should ask customers to enter details such as their names and addresses. ¦It should print a welcome message that includes the customer’s name. ¦It should provide a list of avai

What are pre-processor directives, What are pre-processor directives? -...

What are pre-processor directives? - Pre-processor directives are placed at the beginning of a C program. They begin with # symbol. - This is the place, where library files

Define passing by reference?, A: Method of passing arguments to a function ...

A: Method of passing arguments to a function that takes parameter of type reference.  for instance: void swap( int & x, int &amp;amp; y ) { int temp = x; x =

Boolean functions and simple logic design, The digital signal is one which ...

The digital signal is one which only consists of two states i.e. logic '1'   (+5 volts) and logic '0' (0 volts). Various electronic blocks use logic and these form the basis of a m

C programming assignment, good night i have an assignment that i really nee...

good night i have an assignment that i really need help with. i have to create a struct file with tag name book to have members int book_id char isbn[255]

Modified distribution method for solving transportation prob, i want a c or...

i want a c or c++ code for solving transportation problem using modified distribution method

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