Lec 5 Nested Control Structures

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# Lec 5 Nested Control Structures - PowerPoint PPT Presentation

Lec 5 Nested Control Structures. Calculating the sum or average. int sum = 0; int k = 0, num; while ( k &lt; 5) { num = scan.nextInt(); sum = sum + num; k = k + 1; } ...println(&quot;sum is &quot; + sum); ... println (&quot;avg is &quot; + sum/5.0);. Nesting.

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

int i = 0;

while ( i < 3) {

if ( i == 0) {

...println("zero");

}

else {

...println( i );

}

i = i + 1;

}

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
• Due next Tuesday
• you may finish today
• these are exam style questions so make sure you master them
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