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For the 2018-2019 school year, we have switched to using the WLMOJ judge for lesson information, no new lessons will be added here.

For example, a program may ask the user to keep entering a password until it is correct. An additional control variable is also required with these types of loops.

If we needed to find the number of times we need to divide the number 10 by 2 to get a value less than 1, we could do this as follows:


Turing

var value: int := 10
var numDivides: int := 0
loop
	value = value / 2
	numDivides := numDivides + 1
	exit when value < 1
end loop
put(numDivides)

Python

value = 10
numDivides = 0
while (true):
	value = value / 2
	numDivides += 1
	if (value < 1): break
print(numDivides)

# OR

value = 10
numDivides = 0
while (value >= 1):
	value = value / 2
	numDivides += 1
print(numDivides)

Java

int value = 10;
int numDivides = 0;
while (true) {
	value = value / 2;
	numDivides++;
	if (value < 1)
		break;
}
System.out.println(numDivides)

// OR

int value = 10;
int numDivides = 0;
while (value >= 1) {
	value = value / 2;
	numDivides++;
}
System.out.println(numDivides)
}

Practice

Use a conditional loop to output, in order, all Fibonacci numbers less than 100.