Answer to Question #221425 in C++ for Faizan Muhammad

Question

Write a complete C++ program with the two alternate functions specified below, of which each simply triples the variable count defined in main. Then compare and contrast the two approaches. These two functions are; a) Function tripleByValue that passes a copy of count by value triples the copy and returns the new value. b) Function tripleByReference that passes count by reference via a reference parameter and triples the original value of count.

Answer 1

#include <iostream>
using namespace std;




int tripleByValue(int);
void tripleByReference(int &);


int main(){
	int count=5;
	cout << "Count before call to tripleByValue() is: "<< count;
	cout<<"\nCount returned from tripleByValue() is: "<< tripleByValue(count);
	cout<< "\nCount after tripleByValue() is: " <<count;
	cout<< "\nCount before call to tripleByReference() is: "<< count;
	tripleByReference(count);
	cout << "\nCount after call to tripleByReference() is: "<< count << endl;
	cin>>count;
	return 0;


}
//a) Function tripleByValue that passes a copy of count by value triples the copy and returns the new value. 
int tripleByValue(int count){
	return count *= 3;
}
//b) Function tripleByReference that passes count by reference via a reference parameter and triples the original value of count.
void tripleByReference(int & count){
	count *= 3;
}