Line 14: Char 22: runtime error: signed integer overflow: 1000000000 * 9 cannot be represented

Line 14: Char 22: runtime error: signed integer overflow: 1000000000 * 9 cannot be represented in type ‘int’ (solution.cpp)
第14行：char 22:运行时错误：有符号整数溢出：1000000000*9不能用类型“int”（solution.cpp）表示
也就是说 int 溢出； 将int 改为double（64）

class Solution {
    public int reverse(int x) {
         double res = 0;//int ----double
        int i = 0;
        int[] a = new int[32];
        while(x != 0){
            a[i] = x%10;
            x = x/10;
            i++;
        }
        int k =1 ;
        for(int j = i-1; j>=0 ; j--){
            res += (double)a[j]*k; //int ---double
            if(res > Integer.MAX_VALUE || res < Integer.MIN_VALUE){
                return 0;
            }
            k=k*10;
        }
        
        return (int)res; //double---int
        
        
    }
};

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