static void Main(string[] args)
{
/*local variable declaration*/
int a = 100;
int b = 200;
int?c = null;
int d;
int ret;
NumberManipulator n = new NumberManipulator();
//Calling the FindMax method
ret = n.FindMax(a, b);
Console.WriteLine("Max value is: {0}", ret);
for (int i = 1; i <= 13; i++)
{
Console.WriteLine("Factorial of {0} is: {1}", i, n.Factorial(i));
}
Console.WriteLine("Before method call, value of a : {0}", a);
Console.WriteLine("Before method call, value of b : {0}", b);
/* calling a function to get the value */
n.getValue(out a, out b);
Console.WriteLine("After method call, value of a : {0}", a);
Console.WriteLine("After method call, value of b : {0}", b);
// NUll Coalescing
d = c ?? 5;
Console.WriteLine(" Value of d: {0}", d);
c = 2;
d = c ?? 5;
Console.WriteLine(" Value of d: {0}", d);
Console.ReadLine();
}
static void Main(string[] args)
{
NumberManipulator n = new NumberManipulator();
int x = 5, y = 12;
n.swap(ref x, ref y);
/* C#中的print format方法，结合了Python中的.format及C/C++风格的格式化方法。其中{}中必须按顺序填写值。 */
Console.WriteLine("x = {0}, y = {1}", x, y);
n.getValue(out x, out y);
Console.WriteLine("x = {0}, y = {1}", x, y);
/* 可空类型（nullable）。即在原有类型基础上，追加null值。
* 例如数据库中的Boolean值，除了False、True，还有可能是NULL，在代码中取得数据库对应值的时候，就可以用可空类型。 */
int?num = null;
Console.WriteLine("num = {0}", num);
double?num1 = null;
double?num2 = 3.14;
double num3, num4;
/* null合并运算符。
* 如果第一个操作数为null，则返回第二个操作数的值， 否则返回第一个操作数的值。 */
num3 = num1 ?? 5.1;
num4 = num2 ?? 5.1;
Console.WriteLine("num3 = {0}, num4 = {1}", num3, num4);
Console.ReadKey();
}
static void Main(string[] args)
{
/*local variable declaration*/
int a = 100;
int b = 200;
int? c = null;
int d;
int ret;
NumberManipulator n = new NumberManipulator();
//Calling the FindMax method
ret = n.FindMax(a,b);
Console.WriteLine("Max value is: {0}", ret);
for (int i = 1; i <= 13; i++)
{
Console.WriteLine("Factorial of {0} is: {1}",i , n.Factorial(i));
}
Console.WriteLine("Before method call, value of a : {0}", a);
Console.WriteLine("Before method call, value of b : {0}", b);
/* calling a function to get the value */
n.getValue(out a, out b);
Console.WriteLine("After method call, value of a : {0}", a);
Console.WriteLine("After method call, value of b : {0}", b);
// NUll Coalescing
d = c ?? 5;
Console.WriteLine(" Value of d: {0}", d);
c = 2;
d = c ?? 5;
Console.WriteLine(" Value of d: {0}", d);
Console.ReadLine();
}
static void Main(string[] args)
{
NumberManipulator n = new NumberManipulator();
int a = 100;
Console.WriteLine("在方法调用之前， a = {0}", a);
n.getValue(out a);
Console.WriteLine("在方法调用之后， a = {0}", a);
}
static void Main(string[] args)
{
NumberManipulator n = new NumberManipulator();
int a = 100;
Console.WriteLine("Before method call, value of a: {0}", a);
n.getValue(out a);
Console.WriteLine("After Methid call, value of a: {0}", a);
}
static void Main(string[] args)
{
NumberManipulator n = new NumberManipulator();
/* local variable definition */
int a = 100;
Console.WriteLine("Before method call, value of a : {0}", a);
/* calling a function to get the value */
n.getValue(out a);
Console.WriteLine("After method call, value of a : {0}", a);
Console.ReadLine();
}
static void Main(string[] args)
{
int a = 100;
int b = 200;
int ret;
NumberManipulator n = new NumberManipulator();
ret = n.FindMax(a, b);
Console.WriteLine("最大值：{0}", ret);
Console.WriteLine("6的阶乘是{0}", n.factorial(6));
Console.WriteLine("7的阶乘是{0}", n.factorial(7));
int c = 222;
int d = 333;
Console.WriteLine("按值传参交换之前的c是=>{0}", c);
Console.WriteLine("按值传参交换之前的d是=>{0}", d);
n.swap(c, d);
Console.WriteLine("按值传参交换之后的c是=>{0}", c);
Console.WriteLine("按值传参交换之后的d是=>{0}", d);
int e = 123;
int f = 321;
Console.WriteLine("按引用传递参数交换之前的e是=>{0}", e);
Console.WriteLine("按引用传递参数交换之前的f是=>{0}", f);
n.refSwap(ref e, ref f);
Console.WriteLine("按引用传递参数交换之后的e是=>{0}", e);
Console.WriteLine("按引用传递参数交换之后的f是=>{0}", f);
int g = 158;
Console.WriteLine("按输出传递参数调用函数之前的g是=>{0}", g);
n.getValue(out g);
Console.WriteLine("按输出传递参数调用函数之后的g是=>{0}", g);
int aa, bb;
n.getNoValue(out aa, out bb);
Console.WriteLine("按输出传递参数调用函数之后的aa=>{0},bb是=>{1}", aa, bb);
}
