C#语法基础

分支语句

if

int i = 10;
if(i == 10)
{
    Console.WriteLine("i等于10");
}

if-else

static void Main(string[] args)
{
    int i = 10;
    if(i == 20)
    {
        Console.WriteLine();
    }
    else
    {
        Console.WriteLine("i不等于20");
    }

    if (i < 10)
    {
        Console.WriteLine("i小于10");
    }
    else if (i > 10)
    {
        Console.WriteLine("1>10");
    }
    else
    {
        Console.WriteLine("i=10");
    }
}

switch

int i = 3;
            
switch (i) { 
    case 0:
    Console.WriteLine("男的");
    break;
    case 1:
    Console.WriteLine("女的");
    break ;
    case 2:
    Console.WriteLine("不男不女的");
    break;
    default:
    Console.WriteLine("我可不知道");
    break;
}

循环

for

int i = 10;
for (int j = 0; j < i; j++)
{
    Console.WriteLine(j);
}

增强for

string[] strings = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
foreach (string s in strings)
{
    Console.WriteLine(s);
}

while

int i=0;
while (i < 10)
{
    i++;
    Console.WriteLine(i);
}

#do-while
int i=0;
do
{
    Console.WriteLine(i++);
}while (i<10);