7. For Loops

Question 1

incrementing and decrementing variable values

Answer 1

use ++ or –

Question 2

++

Answer 2

increment operator

x++ is equivalent to x = x + 1

Question 3

–

Answer 3

decrement opereator

x– is equivalent to x = x - 1

Question 4

syntax of for loop example

Answer 4

for (i = 1; i <= n; i++) {
..
..
}

can also initialise i in the () brackets

Question 5

eg. do something 100 times

Answer 5

for (int i = 0; i < 100; i ++)

Question 6

general form of for statement

Answer 6

for (initial statement; loop condition; update statement) {
statement(s)
}

Question 7

infinite loops

Answer 7

infinite loops should also be avoided like for while loops

Question 8

while vs for loops

Answer 8

use FOR when problem can be formulated as:

• for each integer from i to k
• for each element in list
• for each entry in array

use WHILE if FOR doesn’t fit the bill

Question 9

Nested loops

Answer 9

we freq need to nest one loop inside another