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# 3.2. Turg'unlar (Constants)

Agar siz boshqalarning (yoki o'zingizning) mavjud o'zgaruvchan qiymatlarni bekor qilishini xohlamasangiz, const kalit so'zidan foydalaning (bu o'zgaruvchini "doimiy" deb e'lon qiladi, ya'ni o'zgarmas va o'qish uchun):

```cpp
const int myNum = 15;  // myNum will always be 15
myNum = 10;  // error: assignment of read-only variable 'myNum'
```

O'zgarish ehtimoli bo'lmagan qiymatlar mavjud bo'lganda, siz doimo o'zgaruvchini doimiy deb e'lon qilishingiz kerak:

```cpp
const int minutesPerHour = 60;
const float PI = 3.14;
```