书上说:传值参数在方法调用过程中如果改变了参数的值,那么传入方法的参数在方法调用完成以后并不因此而改变,而是保留原来传入时的值。传址参数恰恰相反,如果方法调用过程改变了参数的值,那么传入方法的参数在调用完成以后也随之改变using System;
class Test
{
static void Swap(ref int x, ref int y)
{
int temp = x;
x = y;
y = temp;
}
static void Swap(int x,int y)
{
int temp = x;
x = y;
y = temp;
}
static void Main()
{
int i = 1, j = 2;
Swap(ref i, ref j);
Console.WriteLine("i = {0}, j = {1}", i, j);
Swap(i,j);
Console.WriteLine("i = {0}, j = {1}", i, j);
}
} 程序经编译后执行输出: i = 2, j = 1
i = 2, j = 1
按书上说的:结果应该是
i=2,j=1
i=1,j=2
才对啊
class Test
{
static void Swap(ref int x, ref int y)
{
int temp = x;
x = y;
y = temp;
}
static void Swap(int x,int y)
{
int temp = x;
x = y;
y = temp;
}
static void Main()
{
int i = 1, j = 2;
Swap(ref i, ref j);
Console.WriteLine("i = {0}, j = {1}", i, j);
Swap(i,j);
Console.WriteLine("i = {0}, j = {1}", i, j);
}
} 程序经编译后执行输出: i = 2, j = 1
i = 2, j = 1
按书上说的:结果应该是
i=2,j=1
i=1,j=2
才对啊
其他的如果不是通过引用传递就不会影响到方法外面的