Leetcode 7. Integer inversion

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The point of this problem is to judge that the value is out of bounds. The following code has been submitted for approval.

import "math"

func reverse(x int) int {
    var (
        rev int
        maxR = math.MaxInt32/10
        maxP = math.MaxInt32%10
        minR = math.MinInt32/10
        minP = math.MinInt32%10
    )
    forx ! =0 {
        pop := x%10
        if rev > maxR || (rev == maxR && pop > maxP) {
            return 0
        }
        if rev < minR || (rev == minR && pop < minP) {
            return 0
        }
        rev = rev*10 + pop
        x /= 10
    }
    return rev
}
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