Lesson 8

Conditions: `агар` and `вагарна`

In this lesson: the program makes a decision that depends on a condition.

The whole lesson on one page

Conditions: `агар` and `вагарна`

In this lesson: the program makes a decision that depends on a condition.

`агар`

агар means "if":

1тағ ҳарорат = хонданиРақам();
2агар (ҳарорат > 30) {
3  чоп("Имрӯз гарм аст!");
4}
5чоп("Рӯзи хуш!");

Input

The condition is written in brackets ( ).
The commands inside { } run only if the condition is дуруст.
чоп("Рӯзи хуш!") is outside the { }, so it always runs.

Change the input to 20 and run the program again.

`вагарна`

вагарна means "else" (otherwise). It says what to do if the condition is false:

1тағ рақам = хонданиРақам();
2агар (рақам % 2 === 0) {
3  чоп(рақам, "ҷуфт аст");
4} вагарна {
5  чоп(рақам, "тоқ аст");
6}

Input

Only one of the two parts runs, never both.

`вагарна`

What does this program print?

1тағ х = 3;
2агар (х > 5) {
3  чоп("калон");
4} вагарна {
5  чоп("хурд");
6}

калон
хурд
калон and хурд
nothing

The greater of two numbers

1тағ а = хонданиРақам();
2тағ б = хонданиРақам();
3агар (а > б) {
4  чоп(а);
5} вагарна {
6  чоп(б);
7}

Input

4
9

Formatting

The commands inside { } are written two spaces further to the right. The computer does not care, but people can read the program more easily. In the playground, when you type { and press Enter, the spaces are added for you.

Common mistakes

агар (х = 5): = instead of ===.
; after the condition: агар (х > 5); { … }. Then the { } part always runs.
Forgetting the }. The playground tells you on which line the bracket was opened.

Task: Even or odd

Read a number and print Ҷуфт or Тоқ.

Input: One whole number.

Output: Ҷуфт or Тоқ

Task: The greatest

Read two numbers and print the greater one.

Input: Two numbers.

Output: The greater one.

Task: The exam

Read an exam score. If the score is 50 or more, print Гузашт, otherwise Нагузашт.

Input: One number: the score.

Output: Гузашт or Нагузашт

Task: Absolute value

Read a number and print its absolute value without using Риёзӣ.мутлақ: if the number is negative, change its sign.

Input: One number.

Output: The absolute value.

Conditions: агар and вагарна