add two numbers in c 2b 2b

1#include<iostream>
2int add(int,int);
3int main()
4{
5	using namespace std;
6	int a,b;
7	cout<<"Enter first number: ";
8	cin>>a;
9	cout<<"Enter second number: ";
10	cin>>b;
11	cout<<"Sum = "<<add(a,b);
12}
13int add(int x,int y)
14{
15	return(x+y);
16}

1#include <iostream>
2using namespace std;
3
4//function declaration
5int addition(int a,int b);
6
7int main()
8{
9	int a,b;	//to store numbers
10	int add;	//to store addition 
11	
12	//read numbers
13	cout<<"Enter first number: ";
14	cin>>a;
15	cout<<"Enter second number: ";
16	cin>>b;
17	
18	//call function
19	add=addition(a,b);
20	
21	//print addition
22	cout<<"Addition is: "<<add<<endl;
23	
24	return 0;
25}
26
27//function definition
28int addition(int a,int b)
29{
30	return (a+b);
31}

1#include<iostream>
2using namespace std;
3int main()
4{
5	double number1,number2;
6  	double sum0;
7  	sum=number1+number2;
8  	cout<<sum;
9}