c-resources/CPlusPlus20ForProgrammers-master/examples/ch07/fig07_03.cpp

// fig07_03.cpp
// Pass-by-reference with a pointer argument used to cube a 
// variable's value.
#include <iostream>

void cubeByValue(int x);
void cubeByReference(int& x); // prototype 
void cubeByPointer(int* nPtr);

int main() {
   int number{5};
   std::cout << "Original value of number is " << number << "\n";
   cubeByPointer(&number); // pass number by value to cubeByValue
   std::cout << "New value of number is " << number <<"\n";

   int number1{5};
   
   std::cout << "Original value of number is " << number1 << "\n";
   cubeByReference(number1); // pass number by value to cubeByValue
   std::cout << "New value of number is " << number1 <<"\n";


   int number2{5};
    std::cout << "Original value of number is " << number2 << "\n";
   cubeByValue(number2); // pass number by value to cubeByValue
   std::cout << "New value of number is " << number2 <<"\n";


   

}

// calculate cube of *nPtr; modifies variable number in main 
void cubeByPointer(int* nPtr) {
   *nPtr = *nPtr * *nPtr * *nPtr; // cube *nPtr              
}

void cubeByValue(int x) {
   x = x * x * x; // cube *nPtr
}

void cubeByReference(int& x) {
   x = x * x * x; // cube *nPtr
}


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