Loops allow us to do the same task repeatedly a controlled amount of times.
Use Cases:
- I want to count from 1 to 100 and print out all the even numbers
- While my hand of playing cards totals less than 21, draw a card
- Run the program until the user quits
For loops
// print out the numbers 0-9
for( each number i between 0 and 9) {
do something with that number
}
abstract definition
// print out the numbers 0-9
for( var i = 0; i <= 9; i++) {
Console.WriteLine(i);
}
For loops example
// Count the numbers 1-100,
// if the number is /5 then put in the DOM
for(var i = 1; i <= 100; i++) {
if (i % 5 == 0){
Console.WriteLine(i + " is divisble by 5");
}
}
While loops
While Definition
while (some_truthy_expression){
// do something
}
While Example
var apples = 10;
while (apples > 0){
Console.WriteLine("Should we eat an apple?")
var answer = Console.ReadLine();
if (answer == "yes")
{
apples--;
}
}
