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Data Types · easy

2. The felt252 Primitive

Field elements: the fundamental atom of Cairo.

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In Cairo, the basic data type is a field element (`felt252`), an integer modulo a prime number (`2^251 + 17 * 2^192 + 1`). Modern Cairo adds integer abstractions (`u8`, `u32`, `u64`, `u128`, `u256`, `bool`) on top of felts.

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Check your understanding

  1. 1. What is a felt252 in Cairo?

  2. 2. What happens when integer types like u8 or u128 overflow in Cairo 2.x?

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