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

Pointer declaration for data member, P o i n t e r d e ...

P o i n t e r d e c l a r a t i o n f o r d a t a m e m b e r : M e t h o d 1 : i n t M : : * p x ; / / T h i s

#change to palidrome program, #A palindrome is a string that reads the same...

#A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindrom

Explain function overloading, Function Overloading Function overloading...

Function Overloading Function overloading is a form of polymorphism. Function overloading facilitates explaining one function having many forms. In other words it facilitates e

Load catalogue from file, Implement a menu driven real estate catalogue sys...

Implement a menu driven real estate catalogue system that allows users to perform various catalogue maintenance and search tasks.  You are only allowed to use the C programming la

Write a program to calculate the average of ten numbers, Write a program to...

Write a program to calculate the average of ten numbers       #include stdio.h     /* Only this header is needed since only IO are used */     void main()     {          char

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

, print this pattern 1 01 101 010

print this pattern 1 01 101 0101

Object oriented programming, implementation of the power and factorial in p...

implementation of the power and factorial in programs

C program to check factorial, C Program to check FACTORIAL   main() ...

C Program to check FACTORIAL   main() {             int i,j,m,fact,sum=0;           clrscr();           printf("ENTER THE NO.: ");           scanf("%d",&m);

Luminous Jewels - The Polishing Game, Byteland county is very famous for lu...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

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