java中int转long

package pid69;

public class Solution { 
   
	public static int mySqrt(int x){ 
   
		int result = 0;
		if(x==0 || x==1){ 
   
			return x;
		}else{ 
   
			for(int i=0;i<=x/2;i++){ 
   
				int a = i*i;
				//防止溢出，务必注意右边需要进行强制类型转换，否则有错
				long b = (long)(i+1)*(i+1);
				if( a<=x && b>x){ 
   
					result = i;
					break;
				}
			}
		}
		return result;
	}

	public static void main(String[] args) { 
   
		int a = 2147395600;
		int result = mySqrt(a);
		System.out.println(result);

	}
}