Beginner with c# 4[1]

1¡£4 ô¤¶¨òåààðí£¨predefined types£©

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¶¼öªµà£º*/
int i = 0;
if (i = 0) { // bug: ó¦¸ãêç (i == 0)
....
}
/* êçã»óðîêìâµä¡£µ«ôúc#öð»áòý·¢ò»¸ö±àòë´íîó£¨error cs0029: cannot implicitly convert
type 'int' to 'bool'£©¡£µ±è»£¬õâñùîþéüáëò»µãã»óð±øòªµäáé»îðô¡£îòãçôùò²²»äüõâñù£º*/
string str;
....
if(str = console.readline()) {
  console.writeline("your comments are: {0}",str);
....
/* ¶ø±øð룺*/
using system;
class booltest
{
  static void main() {
    string str = console.readline();//ò²¿éòô£ºstring str;
    if(str == "")                   //        if((str = console.readline()) == "")
      console.writeline("i can't read your comments. please tell me something! o.k.?");
    else
      console.writeline("your comments are: {0}",str);
  }
}
/*
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type      description                                      examples

object    the ultimate base type of all other types        object o = new stack();

string    string type; a string is a sequence of           string s = "hello";