Go - integer overflow

 

func main() {
    fmt.Printf("math.MaxInt32:                         %d\n", math.MaxInt32)
    fmt.Printf("math.MinInt32:                        %d\n", math.MinInt32)
    var counter int32 = math.MaxInt32
    counter++
    fmt.Printf("math.MaxInt32 + 1 overflow:           %d\n", counter)
    fmt.Printf("math.MaxInt32 in binary:               %032b\n", math.MaxInt32)
    fmt.Printf("math.MaxInt32 + 1 overflow in binary: %032b\n", counter)
    var zero int32 = 0
    fmt.Printf("0 of Int32 in binary:                  %032b\n", zero)
    var minusZero int32 = -0
    fmt.Printf("-0 of Int32 in binary:                 %032b\n", minusZero)
    var one int32 = 1
    fmt.Printf("1 of Int32 in binary:                  %032b\n", one)
    var minusOne int32 = -1
    fmt.Printf("-1 of Int32 in binary:                 %032b\n", minusOne)
}

 

zzh@ZZHPC:/zdata/Github/ztest$ go run main.go
math.MaxInt32:                         2147483647
math.MinInt32:                        -2147483648
math.MaxInt32 + 1 overflow:           -2147483648
math.MaxInt32 in binary:               01111111111111111111111111111111
math.MaxInt32 + 1 overflow in binary: -10000000000000000000000000000000
0 of Int32 in binary:                  00000000000000000000000000000000
-0 of Int32 in binary:                 00000000000000000000000000000000
1 of Int32 in binary:                  00000000000000000000000000000001
-1 of Int32 in binary:                 -0000000000000000000000000000001

 

 

 

 

 

Remember that Go provides a package to deal with large numbers: math/big. This might be an option if an int isn’t enough.