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

61 lines
2.2 KiB
C++

// 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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