Lec 5 Nested Control Structures

1. Lec 5 Nested Control Structures

2. Calculating the sum or average int sum = 0; int k = 0, num; while ( k < 5) { num = scan.nextInt(); sum = sum + num; k = k + 1; } ...println("sum is " + sum); ...println("avg is " + sum/5.0);

3. Nesting • The idea of nesting is to put one thing inside of another: • nested: ( [ { } { } ] { } ) • not nested: ( ) [ ] { } [ ] • NOT nested: ( [ { ) ] }

4. Nesting control structures • We have seen several control structures • do loops • while loops • if statements (including compound if statements with else if and else ) • We can nest any of these structures inside another to get different behaviors

5. While loop with if inside int i = 0; while ( i < 3) { if ( i == 0) { ...println("zero"); } else { ...println( i ); } i = i + 1; }

6. While loop with if inside int i = 0, big=0, num; while ( i < 5) { num = scan.nextInt(); if ( num > 50) { big = big+1; } i = i + 1; } ...println("number of big: " + big);

7. Work on Loop Drills in class • Due next Tuesday • you may finish today • these are exam style questions so make sure you master them

8. Lab 5 • Guessing Game • pick a random number and store it • Do Loop: • get user guess • if guess is high or low, say it • when guess is correct leave loop