C++ examples for Function:Function Parameter
Comparing pass-by-value and pass-by-reference with references.
#include <iostream> int squareByValue(int); void squareByReference(int &); int main(int argc, const char *argv[]) { int x = 2;/*w w w.jav a 2 s . co m*/ int z = 4; // demonstrate squareByValue std::cout << "x = " << x << " before squareByValue\n"; std::cout << "Value returned by squareByValue: " << squareByValue(x)<< std::endl; std::cout << "x = " << x << " after squareByValue\n" << std::endl; // demonstrate squareByReference std::cout << "z = " << z << " before squareByReference\n"; squareByReference(z); std::cout << "z = " << z << " after squareByReference\n"; return 0; } int squareByValue(int number) { return number *= number; } void squareByReference(int &numberRef) { numberRef *= numberRef; }