Function in C++
Function in C++ 
Function in cpp
A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main().we can also say that A function is block of code that performs specific task.
Syntax of function:
return_type Function_Name(parameters){
code performs that task;
}
Types of function:
There are two type function in C++
1.Standard Library Functions: Predefined in C++
2.User define Function: C++ allows the programmer to define their own function .
Program: Write a program to find out the sum of two number using Function in C++.
Code:
#include<iostream>
using namespace std;
int sum(int num1,int num2)
{
int c=num1+num2;
return c;
}
int main()
{
int num1,num2;
cout<<"Enter the two number for addtion ";
cin>>num1;
cin>>num2;
cout<<"The sum of "<<num1<<" and "<<num2<<" is "<<sum(num1,num2);
return 0;
}
Output:
Enter the two number for addtion 10
30
The sum of 10 and 30 is 40
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Program: Write a program to find the sum of natural number using function in CPP.
Code:
#include<iostream>
using namespace std;
int addNumbers(int n);
int main()
{
int num, sum;
cout<<"Enter a number ";
cin>>num;
sum=addNumbers(num);
cout<<"The sum of "<<num<<" natural number is "<<sum;
}
int addNumbers(int n)
{
if (n != 0)
return n + addNumbers(n - 1);
else
return n;
}
Output:
Enter a number 100
The sum of 100 natural number is 5050
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Program: Write a program to find the fibonaci serise at that postion using function in cpp.
Code:
#include<iostream>
using namespace std;
int fib(int n)
{
if((n==1)||(n==0))
return n;
else
return fib(n-2)+fib(n-1);
}
int main()
{ int num;
cout<<"Enter the number to find the fibonaci serise at that postion ";
cin>>num;
cout<<"The fibonaci serise at "<<num<<" is "<<fib(num);
return 0;
}
Output:
Enter the number to find the fibonaci serise at that postion 3
The fibonaci serise at 3 is 2
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