Head A C # Chinese version chapter II page67

The If/else statement decides to use the If/else statement to tell the program to do certain things when you set the state to be true (or false). Many if/else statements check that two expressions are equal. Then you need to use the = = operator. This is different from the = operator you use to assign a value.

Don't get confused by the double operator! You assign a value to a variable with an equal sign (=), but the two equals sign (= =) is used to compare two variables. You can't believe how many bug--in the program even the veteran programmer wrote it! --it is because of the wrong to use = =. If you see the IDE prompting you to "not implicitly convert int to bool," that might be the wrong thing to say.