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Default Arguments in User-defined Functions of Programming in CPP
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Usage 
Default Arguments can be used to pass default values to arguments when values are undefined in main function.
Example
#include <iostream>
using namespace std;

void display(int = 4);

int main()
{
    cout<<"No values passed:\n";
    display();
   
    cout<<"value passed:\n";
    display(5);
  

    return 0;
}

void display(int a){

        cout<<"the value of a"<<a;
    }
    cout<<endl;
}
Output 
No values passed:
The value of a=4

value passed
The value of a=5
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