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uint int golang difference

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May 15, 2023 am 10:02 AM

uint and int are both integer data types in the Golang language. Their usage and functions are basically the same, but there are still some differences between them.

uint is an unsigned integer data type in the Golang language, representing a non-negative integer, with a value ranging from 0 to 2 to the nth power -1, where n is the number of digits occupied by the uint type. For example, uint8 occupies 8 bits and the value range is 0~255, while uint64 occupies 64 bits and the value range is 0~18446744073709551615. Corresponding to it is the int type, which is a signed integer data type that can represent positive integers, negative integers and 0. The number of digits of the int type depends on the platform. On a 32-bit machine, the int type occupies 4 bytes, and on a 64-bit machine, the int type occupies 8 bytes.

The main differences between uint and int types are as follows:

Different value ranges

uint type can only represent non-negative integers , the value range is larger than int, but it cannot represent negative integers. The int type can represent positive integers, negative integers and 0. The value range is smaller than that of uint, but it is more flexible.

Different digits

The digits of uint and int types are different. Among them, the number of digits of the uint type is related to the occupied space. For example, the uint8 type occupies 8 bits, the uint16 type occupies 16 bits, the uint32 type occupies 32 bits, and the uint64 type occupies 64 bits. The number of digits of the int type is related to the platform, 32 The int type occupies 4 bytes on a 64-bit machine and 8 bytes on a 64-bit machine.

Different memory usage

Because uint and int types have different digits, they occupy different spaces in memory. Normally, the memory footprint of uint type is smaller than that of int type.

Different applicable scenarios

Based on the above points, we can see that the uint type is suitable for scenarios that need to represent non-negative integers, such as length, file size, etc. The int type is more flexible and can represent positive integers, negative integers and 0, and is suitable for a wider range of scenarios.

When using uint and int types, you need to pay attention to the selection of data types to avoid problems such as type errors and data overflows. At the same time, when performing operations such as bit operations and data comparisons, it is also necessary to select the appropriate data type according to the actual situation.

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