cout and cin in cpp with example

cout in c++

1. cout is a statement that is used to display an output over a console.
2. cout is an object of ostream class which is defined in the iostream header file.

there are two ways to use cout:

• first way to use cout is by writing std every time before it.

#include<iostream>

int main()

{

    std::cout<<"this is my";

    std::cout<<" first message";

     return 0;

}

• second way is by using the statement "using namespace std" after including the header file. (recommended)

#include<iostream>

using namespace std;

int main()

{

    cout<<"this is my";

    cout<<" first message";

     return 0;

}

how to break the line while using cout

by using endl ,you can break the line.

example:

#include<iostream>
using namespace std;
int main()
{
cout<<"this is my"<<endl;

cout<<" next message";
return 0;
}

how to display the data of variables in c++

example:

#include<iostream>

using namespace std;

int main()

{

    int age=10;

    float height=4.5;

    cout<<"age is "<<age;

    cout<<" height is "<<height;

cout<<endl;//breaking the line

    //display the variable's value in a single cout

    cout<<"age is "<<age<<" height is"<<height;

return 0;

}

cin in c++

1. the cin statement is used to take data from a user over a console.
2. cin is the object of istream class which is defined in the header file.

• first way to use cout is by writing std every time before it.

#include<iostream>

int main()

{

    int age;

    float height;

    std::cin>>age;

    std::cin>>height;

    return 0;

}

• second way is by using the statement "using namespace std" after including the header file. (recommended)

#include<iostream>

using namespace std;

int main()

{

    int age;

    float height;

   cin>>age;

   cin>>height;

   return 0;

}