C++ learning

Chapter 6: Controlling Program Flow

1. if (statement)
   statement;
   else
   statement;
2. if (statement)
   {
   statement;
   statement:
   }
   else
   {
   statement;
   statement;
   }
3. string userInput;
   getline (cin, userInput); aimed for inputting a string
4. enum DaysOfWeek
   {
   Sunday = 0,
   Monday,
   Tuesday,
   Wednesday,
   Thursday,
   Friday,
   Saturday};
   since we have initial the Sunday =0, we can obtain that Monday =1, Tuesday =2
5. if ()
   …;
   else if ()
   …;
   else if ()
   …;
   else
   …;
6. switch(expression)
   {
   case LabelA:
   DoSomething;
   break;
   case LabelB:
   DoSomethingElse;
   break;
   // And so on…
   default:
   DoStuffWhenExpressionIsNotHandledAbove;
   break;
   }
7. (conditional expression evaluated to bool) ? expression1 if true : expression2 if false;
   eg:int max = (num1 > num2)? num1 : num2; // max contains greater of num1 and num2
8. SomeFunction()
   {
   Start: // Called a label
   CodeThatRepeats;
   goto Start;
   }
9. while(expression)
   {
   // Expression evaluates to true
   StatementBlock;
   }
10. do
    {
    StatementBlock; // executed at least once
    } while(condition); // ends loop if condition evaluates to false
11. for (initial expression executed only once;
    exit condition executed at the beginning of every loop;
    loop expression executed at the end of every loop)
    {
    DoSomething;
    }

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来源： https://blog.csdn.net/weixin_42640552/article/details/103968143