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

Integration, to find the area under the curve y = f(x) between x = a and x ...

to find the area under the curve y = f(x) between x = a and x = b

# Bank Account class, Write a C++ program to test the Bank Account class fo...

Write a C++ program to test the Bank Account class for 10 customers.

2, how to do 2, 4, 8 associativity

how to do 2, 4, 8 associativity

Program for queue and vector, #include #include #include usi...

#include #include #include using namespace std; #define MAX 5 #define INF (1 #define DEBUG if(0) #define pii pair #define pb(x) push_back(x) class

Array, array itself is a pinter.explain

array itself is a pinter.explain

#title.digital clock, Write a program to print a digital clock which displa...

Write a program to print a digital clock which displays the time for 2 hours .

C program for sorting of character , #include stdio.h> #include conio.h>...

#include stdio.h> #include conio.h> #include string.h>   void main() {           char a[50],b[25][25],l[25],temp1;           int i=0,j=0,k=0,l1[25],c=0,c1=0,t=

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