二进制表示整数
public static String transferBy32(int num) {
StringBuilder sb = new StringBuilder();
for (int w = 31; w >= 0; w--) {
sb.append((num & (1 << w)) == 0 ? "0" : "1");
}
return sb.toString();
}
负数的表示方式为源数字取反+1；
验证如下：
public static void main(String[] args) {
System.out.println(transferBy32(1));
System.out.println(transferBy32(2));
System.out.println(transferBy32(3));
System.out.println(transferBy32(~3 + 1));
System.out.println(transferBy32(-3));
}
输出结果：
00000000000000000000000000000001
00000000000000000000000000000010
00000000000000000000000000000011
11111111111111111111111111111101
11111111111111111111111111111101
