Passing int by value : function parameters « Function « C++ Tutorial






  1. C++ Tutorial
  2. Function
  3. function parameters
#include <iostream>
 
 void swap(int x, int y);
 
 int main()
 {
     int x = 5, y = 10;
     std::cout << "Main. Before swap, x: " << x << " y: " << y << "\n";
     swap(x,y);
     std::cout << "Main. After swap, x: " << x << " y: " << y << "\n";
     return 0;
 }
 
 void swap (int x, int y)
 {
     int temp;
     std::cout << "Swap. Before swap, x: " << x << " y: " << y << "\n";
     temp = x;
     x = y;
     y = temp;
     std::cout << "Swap. After swap, x: " << x << " y: " << y << "\n";
 }

Main. Before swap, x: 5 y: 10
Swap. Before swap, x: 5 y: 10
Swap. After swap, x: 10 y: 5
Main. After swap, x: 5 y: 10




7.3.function parameters
7.3.1.Passing int by value
7.3.2.Define function to accept three int parameters
7.3.3.Pass a pointer to a function.
7.3.4.Pass variable address to a function
7.3.5.Pass int array to a function
7.3.6.Declare int array parameter for a function without indicating the array length
7.3.7.Function parameter: Use int pointer to accept an array
7.3.8.Use array as function's parameter
7.3.9.Change the contents of an array using a function
7.3.10.Pass a string to a function: Invert the case of the letters within a string
7.3.11.Change a call-by-value parameter does not affect the argument
7.3.12.Demonstrate the pointer version of swap(): Exchange the values of the variables pointed to by x and y
7.3.13.Using reference parameters
7.3.14.Passing a two-dimensional array to a function
7.3.15.Passing an array to a function
7.3.16.var args has to be the last one
7.3.17.the use of ... and its support macros va_arg, va_start, and va_end
7.3.18.Handling an array parameter as a pointer