Parameters and Arguments

When defining a function, you can specify one or more parameters. Parameters are like variables that are defined in the function's declaration and are used to pass values into the function. When calling a function, you can provide arguments which correspond to the parameters of the function.

Let's take a look at an example:

1#include <iostream>
2using namespace std;
3
4// Function declaration
5int add(int a, int b);
6
7int main() {
8  int num1, num2, sum;
9
10  cout << "Enter first number: ";
11  cin >> num1;
12
13  cout << "Enter second number: ";
14  cin >> num2;
15
16  // Function call
17  sum = add(num1, num2);
18
19  // Print the sum
20  cout << "Sum: " << sum << endl;
21
22  return 0;
23}
24
25// Function definition
26int add(int a, int b) {
27  return a + b;
28}

In this example:

• We declare a function add that takes two integer parameters a and b.
• Inside the main function, we prompt the user to enter two numbers and store them in num1 and num2 respectively.
• We then call the add function with the arguments num1 and num2 to calculate their sum.
• Finally, we print the sum using the cout object.

You can run the above code to see it in action!

xxxxxxxxxx

#include <iostream>

using namespace std;

​

// Function declaration

int add(int a, int b);

​

int main() {

  int num1, num2, sum;

​

  cout << "Enter first number: ";

  cin >> num1;

​

  cout << "Enter second number: ";

  cin >> num2;

​

  // Function call

  sum = add(num1, num2);

​

  // Print the sum

  cout << "Sum: " << sum << endl;

​

  return 0;

}

​

// Function definition

int add(int a, int b) {

  return a + b;

}