Go language provides inbuilt support for generating random numbers of the specified type with the help of a math/rand package. This package implements pseudo-random number generators. These random numbers are generated by a source and this source produces a deterministic sequence of values every time when the program run. And if you want to random numbers for security-sensitive work, then use the crypto/rand package.
You are allowed to generate the non-negative pseudo-random number of 63-bit integer as an int64 type from the default source with the help of the Int63() function provided by the math/rand package. So, you need to add a math/rand package in your program with the help of the import keyword to access the Int63() function.
func Int63() int64
Let us discuss this concept with the help of the given examples:
Random Number 1: 5577006791947779410 Random Number 2: 8674665223082153551 Random Number 3: 6129484611666145821
Result 1: 5577006791947779423 Result 2: 8674665223082154037 Result 3: 6129484611666146334