C++中algorithm里count()函数
函数原型及描述
count(),存在于vector和string中,分别对单个数字和单个字符计数
用法
string mainString = Let life be beautiful like summer flowers,death like autumn leaves;
int total = count(mainString.begin(), mainString.end(), 'u');
cout << this ch
助记词生成原理:
助记词生成的过程是这样的:先生成一个128位随机数,再加上对随机数做的校验4位,得到132位的一个数,然后按每11位做切分,这样就有了12个二进制数,然后用每个数去查BIP39定义的单词表,这样就得到12个助记词
答案: convince gravity void lyrics autumn waste story distance stories home local suit
The seasonal variability of cirrus depolarization ratio and its altitude at the region of Beijing (39.93°N,116.43°E, the capital of China) are presented. From the results obtained from the cloud aerosol lidar and infrared pathfinder satellite observa
enum实现
JDK5中提供了Java枚举类型的实现,与其说是一种新类型,倒不如说是一种语法糖。
public enum Season {
SPRING,
SUMMER,
AUTUMN,
WINTER
}
通过反编译工具 jad来看看这段代码是如何实现的,反编译后的代码如下:
public final class Season extends Enum {
public static Season[] values() {
return (S