sscanf和sprintf的使用强化

• 1、sscanf和sprintf的使用强化
• 2、INT_MAX和INT_MIN两个宏的使用强化

class Solution {
public:
    int reverse(int x) {
        int tag=0;
        long long num=x;//注意，一定要用long long承载，不然INT_MIN不好受
        if( num<0 )
        {
            tag=1;
            num*=(-1);
        }

        char solve[100];
        sprintf(solve,"%lld",num);
        int len=strlen( solve );
        int L=0,R=len-1;
        while( L<R )
        {
            solve[L]^=solve[R];
            solve[R]^=solve[L];
            solve[L]^=solve[R];
            ++L;
            --R;
        }
        long long ret;
        long long one=INT_MAX;
        long long Two=INT_MIN;

        sscanf(solve,"%lld",&ret);

        //小于0
        if( tag )
        {
            if( (long long )(-1)*ret<Two )
            {
                return 0;
            }
            else
            {
                return -1*(int)ret;
            }
        }
        else
        {
            if( ret>one )
            {
                return 0;
            }
            else
            {
                return (int)ret;
            }
        }

    }
};