C# if switch語(yǔ)句

if (condition) 
   statement(s) 
else 
   statement(s) 

bool isZero; 
if (i == 0) { 
  isZero = true; 
  Console.WriteLine("i is Zero"); 
} else { 
  isZero = false; 
  Console.WriteLine("i is Non-zero"); 
} 

if (5 < 2 * 3) {
    Console.WriteLine ("true"); // true 
}

if (5 < 6) {
 Console.WriteLine ("true");
 Console.WriteLine ("Let"s move on!"); 
} 

if (1 == 2){
   Console.WriteLine ("equal"); 
}else{
   Console.WriteLine ("False"); // False 
}

if (4 == 5){
   Console.WriteLine ("4 is 5"); 
}else if (2 + 2 == 4) {
   Console.WriteLine ("4 is 4"); // Computes 
}

void ShowCard(int cardNumber) { 
    switch (cardNumber) {
        case 13: 
            Console.WriteLine ("King"); 
            break;
        case 12: 
            Console.WriteLine ("Queen"); 
            break;
        case 11: 
            Console.WriteLine ("Jack"); 
            break;
        case -1: 
            goto case 12;
        default:/* ww  w  .ja  v  a  2  s .c o  m*/
            Console.WriteLine (cardNumber); 
            break; 
    } 
} 

switch (cardNumber) { 
    case 13: 
    case 12: 
    case 11:
        Console.WriteLine ("J Q K"); 
        break;
    default: 
        Console.WriteLine ("Number"); 
        break; 
}