Why is 1 in the code the wrong answer and what is the right one and why ?

Question

" The for loop" exercise is:
Fill in the blanks to print even values from 0 to 20.
for (int x=0; x<=20 x+=1){
cout <<x<< endl;
}

Answer 1

thank you 😊

Answer 2

the answer lies in "To print even values" so you have to add x+=2 to print:
2
4
6
8
10
...
up to 20

Answer 3

okay, yes I understand it
I thought about 1, 2, 3 ... till 20 :)

Answer 4

If x+=1 is used, x is incremented by 1 in every iteration. So, every number from 0 to 20 is displayed.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

If x+=2 is used, x is incremented by 2 in every iteration. So, every even number from 0 to 20 is displayed.

0 2 4 6 8 10 12 14 16 18 20

And, semicolon is missing before incrementation.

Answer 5

your question has been answered but I thought you might also want to know that although 'x+=1' works correctly, you might want to use 'x++' in place of that because its more generally accepted and easier to type

Answer 6

need to add 2 to print even value.. x += 2 ;

Answer 7

If this was python you could use an if statement to test if modulus 2 ==0 and print it out or cout in this case. But in the case of c++ , using modulus with if statement will just add another statement.... Think of it as waste of resources.

Answer 8

simple is that we want even numbers that why we increment i value by 2.

Answer 9

4-2=2; 6-4=2; 8-6=2...So it's 2.

Answer 10

your for its wrong missing semicolons
for (int x=0; x<=20; x+=1) { ...
}

Answer 11

hey jas
remember that the compiler could pass some programmer's mistakes
for (int x=0; x<=20 x+=1){
needs a ";" after 20 and must be like this
for (int x=0; x<=20; x+=2){

that is one reason many people hates "C" language 😢
😆😆😆

Answer 12

c language is more complex than other languages so carefully go through it, and put x+=2 to get your result. if(x=0;x<=20;x+=2)

Answer 13

it says to give even numbers and ur starting value is 0 so u have to aplly +2 to get even numbers

Answer 14

the increment should be done by 2 not 1

Answer 15

I want to help u..but I can't help..because I don't know a lot of c++ ..I am really sorry

Answer 16

+Jasmin , did you learned web languges 1st or c++ and oop 1st ?,