a simple function to reverse integer in go.
//negative numbers are not handled
func reverse(num int) int {
z := 0
for num > 0 {
z = z*10 + num%10
num /= 10
}
return z
}
//negative numbers and 32 bit integer overflow is handled
func reverse(x int) int {
isNegative := false
maxInt32 := 1<<31 - 1
if x < 0 {
isNegative = true
x = -x
}
res := 0
for x > 0 {
res = res*10 + x%10
x /= 10
}
if res > maxInt32 {
return 0
}
if isNegative {
return -res
}
return res
}