7. Reverse integer integer

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

To give you one 32 Signed integer of bit x , Return to x The result of reversing the number part in .

If the integer after inversion exceeds 32 The range of signed integers of bits  [−231,  231 − 1] , Just go back to 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

Suppose the environment doesn't allow storage 64 An integer （ With or without sign ）.

Example 1:

Input: x = 123
Output: 321

Example 1：

Input ：x = 123
Output ：321

Example 2:

Input: x = -123
Output: -321

Example 2：

Input ：x = -123
Output ：-321

Example 3:

Input: x = 120
Output: 21

Example 3：

Input ：x = 120
Output ：21

Example 4：

Input ：x = 0
Output ：0

Constraints: Tips ：

-<= x <= - 1

C Language ：

int reverse(int x){
    long int r=0;
    while(x)
    {
        if(r>INT_MAX/10||r<INT_MIN/10)
        {
            return 0;
        }
        r=r*10+x%10;
        x=x/10;
    }
    return r;
}

Execution results ： adopt

Execution time ：4 ms, In all  C  Defeated in submission 56.33% Users of

Memory consumption ：5.4 MB, In all  C  Defeated in submission 71.08% Users of

Pass the test case ：1032 / 1032