Constant overflows int
yourbasic.org/golang
Why doesn’t this code compile?
const n = 9876543210 * 9876543210
fmt.Println(n)../main.go:2:13: constant 97546105778997104100 overflows int
Answer
The untyped constant n must be converted to a type before it can be
assigned to the interface{} parameter in the call to fmt.Println.
fmt.Println(a ...interface{})When the type can’t be inferred from the context, an untyped constant
is converted to a bool, int, float64, complex128, string or rune
depending of the format of the constant.
In this case the constant is an integer, but n is larger
than the maximum value of an int.
However, n can be represented as a float64.
const n = 9876543210 * 9876543210
fmt.Println(float64(n))
9.75461057789971e+19
For exact representation of big numbers, the math/big package implements arbitrary-precision arithmetic. It supports signed integers, rational numbers and floating-point numbers.
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