Lec 5 nested control structures
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Lec 5 Nested Control Structures. 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);. Nesting.

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Lec 5 nested control structures

Lec 5 Nested Control Structures


Calculating the sum or average
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);


Nesting
Nesting

  • The idea of nesting is to put one thing inside of another:

    • nested: ( [ { } { } ] { } )

    • not nested: ( ) [ ] { } [ ]

    • NOT nested: ( [ { ) ] }


Nesting control structures
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


While loop with if inside
While loop with if inside

int i = 0;

while ( i < 3) {

if ( i == 0) {

...println("zero");

}

else {

...println( i );

}

i = i + 1;

}


While loop with if inside1
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);


Work on loop drills in class
Work on Loop Drills in class

  • Due next Tuesday

  • you may finish today

  • these are exam style questions so make sure you master them


Lab 5
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


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