# Go: What’s the maximum value of an int?

Go has two predeclared integer types with implementation-specific sizes:

- a
`uint`

has either 32 or 64 bits; - an
`int`

has the same size as a`uint`

.

This code computes the limit values as **untyped constants**:

```
const BitsPerWord = 32 << (^uint(0) >> 63) // either 32 or 64
const (
MaxInt = 1<<(BitsPerWord-1) - 1 // either (1<<31)-1 or (1<<63)-1
MinInt = -MaxInt - 1 // either -1<<31 or -1<<63
MaxUint = 1<<BitsPerWord - 1 // either (1<<32)-1 or (1<<64)-1
)
```

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