1. Decisions & Flows

2. If  if ( condition ) statement if (s.gpa <= 1.0) expel(s); if (x<y)// then swap x,y {x += y; y = x-y; x = x-y; };

3. Relational Operators  >, <  ==// =  !=//   >=//   <=// 

4. Pitfalls Warnings:  “=“  “==“  Comparing reals: precision

5. Or Else  if ( condition ) statement1 else statement 2; if (x<y)// set min(x,y)=0 {x=0;// & set z=max(x,y) z=y; } else {y=0; z=x; }

6. Conditions  if ( not taken(cs113) or grade<=2 ) take(cs113);  if ( ! taken(cs113) || grade<=2 ) take(cs113);  Both mean the same First easier to read Second easier to “parse”

7. More conditions  if ( not (confused or lost) and awake ) congratulations; else if ( done(hw1) and bored ) apologies; else warning;