Question

Explain Call by value method with a suitable example.

Answer 1

Call by value method:

This method copies the value of an actual parameter into the formal parameter of the function. In this case, changes made to the formal parameter within the function will have no effect on the actual parameter.

Example:
#include <iostream>
using namespace std;
void display(int x)
{
int a = x * x;
cout<<“\n\nThe Value inside display function
(a * a):”<<a;
}
int main( )
{
int a;
cout<<“\nExample : Function call by value:”;
cout<<“\n\nEnter the Value for A cin>>a;
display(a);
cout<<”\n\nThe Value inside main function “<<a;
return (0);
}
Output:
Example: Function call by value Enter the Value for A: 5
The Value inside display function (a * a) : 25
The Value inside main function 5