C++ programming tutorial 4

 Function in C++ programming -

Defination of the function -

In function we write a block or a section of code for writing less code or and more use if we write a block of code repeatly then by using function we do not have to requirement to write a block of code repeatly and after make a function we have to call it on that requirement and in one line we run a lots of line of code and run it on the less time and more work this is a function and use of it on the c plus plus programming language

Syntax -

#include<iostream>

using namespace std;

// defining function globally

void function(){
// writting code here 

...

...

}

int main()

{

..

// calling function in main program

function();

return 0;

}

code of the function -

#include<iostream>

using namespace std;

// Defining the function

void container(int x1, int x2){

      cout<<"value of x1 :"<<x1<<endl;

      cout<<"value of x2 :"<<x2<<endl;           

}

int main()

{

      int a,b;

      //here we enter the value for passing 

      cout<<"Enter the value of a:"<<endl;

      cin>>a;

      cout<<"Enter the value of b:"<<endl;

      cin>>b;

      // calling the function here

      container(a,b);// also passing the value as argument 

      return 0;

}

Output - 

Enter the value of a:

12

Enter the value of b:

11

value of x1 :12

value of x2 :11

2. write a program to call function two times 

#include<iostream>

using namespace std;

// In this program we call funcation two times

// Defining the function

void container(int x1, int x2){

      cout<<"value of x1 :"<<x1<<endl<<endl;

      cout<<"value of x2 :"<<x2<<endl<<endl;           

}

int main()

{

      int a,b;

      //here we enter the value for passing 

      cout<<"Values which was entered first time ->"<<endl<<endl;

      cout<<"Enter the value of a:"<<endl;

      cin>>a;

      cout<<"Enter the value of b:"<<endl;

      cin>>b;

      // calling the function here

      container(a,b);// also passing the value as argument 

      int a1,b1;

      cout<<"Values which was entered Second time ->"<<endl<<endl;

      cout<<"Enter the value of a1:"<<endl;

      cin>>a1;

      cout<<"Enter the value of b1:"<<endl;

      cin>>b1;

      container(a1,b1);// also passing the value as argument 

      return 0;

}

output -

Values which was entered first time ->

Enter the value of a:

12

Enter the value of b:

12

value of x1 :12

value of x2 :12

Values which was entered Second time ->

Enter the value of a1:

12

Enter the value of b1:

12

value of x1 :12

value of x2 :12

3. code where we making addition and Subtraction through function

#include<iostream>

using namespace std;

// Defining the function

void addition(int x1, int x2){

     int t;

     t=x1 + x2;

     cout<<"addition of two number is :"<<t<<"\n\n";          

}

void subtraction(int x1, int x2){

     int t;

     t=x1 - x2;

     cout<<"subtraction of two number is :"<<t<<"\n\n";          

}

int main()

{

      int a,b;

      //here we enter the value for passing 

      cout<<"For adding entered values :"<<endl<<endl;

      cout<<"Enter the value of a:"<<endl;

      cin>>a;

      cout<<"Enter the value of b:"<<endl;

      cin>>b;

      addition(a,b);

      

      int a1,b1;

      //here we enter the value for passing 

      cout<<"For subtraction entered values :"<<endl<<endl;

      cout<<"Enter the value of a1:"<<endl;

      cin>>a1;

      cout<<"Enter the value of b1:"<<endl;

      cin>>b1;

      addition(a1,b1);

      return 0;

}

output -

For adding entered values :

Enter the value of a:

1

Enter the value of b:

1

addition of two number is :2

For subtraction entered values :

Enter the value of a1:

1

Enter the value of b1:

1

addition of two number is :2