ccckmit

#ChatGPT

歐拉公式（Euler's formula）是一個非常重要的數學定理，它表示:

$$e^{i\theta} = \cos{\theta} + i\sin{\theta}$$

其中 $e$ 是自然數 $2.71828\ldots$ ， $i$ 是虛數的基本单位， $\theta$ 是任意的实数。

歐拉公式的證明可以由下面幾個步驟完成：

ccckmit

# scrapy crawl quotes 


```
Hero3C@DESKTOP-O093POU MINGW64 /c/tim/prog10_4
$ scrapy crawl quotes
2022-11-10 21:04:58 [scrapy.utils.log] INFO: Scrapy 2.7.1 started (bot: prog10_4)
2022-11-10 21:04:58 [scrapy.utils.log] INFO: Versions: lxml 4.9.1.0, 
libxml2 2.9.12, cssselect 1.2.0, parsel 1.7.0, w3lib 2.0.1, Twisted 22.10.0, Python 3.10.8 (tags/v3.10.8:aaaf517, Oct 11 2022, 16:50:30) [MSC v.1933 64 bit (AMD64)], pyOpenSSL 22.1.0 (OpenSSL 3.0.7 1 Nov 2022), cryptography 38.0.3, Platform Windows-10-10.0.19043-SP0
2022-11-10 21:04:58 [scrapy.crawler] INFO: Overridden settings:

ccckmit

ccckmit

csienqu-teacher:~ csienqu$ docker pull ubuntu:latest
latest: Pulling from library/ubuntu
6b98dfc16071: Pull complete 
4001a1209541: Pull complete 
6319fc68c576: Pull complete 
b24603670dc3: Pull complete 
97f170c87c6f: Pull complete 
Digest: sha256:d93e92b9e184f69873bfd8570647a4298b070119baad4f65d003c96464d858da
Status: Downloaded newer image for ubuntu:latest
csienqu-teacher:~ csienqu$ docker images

ccckmit

csienqu-teacher:~ csienqu$ docker pull ubuntu:latest
latest: Pulling from library/ubuntu
6b98dfc16071: Pull complete 
4001a1209541: Pull complete 
6319fc68c576: Pull complete 
b24603670dc3: Pull complete 
97f170c87c6f: Pull complete 
Digest: sha256:d93e92b9e184f69873bfd8570647a4298b070119baad4f65d003c96464d858da
Status: Downloaded newer image for ubuntu:latest
csienqu-teacher:~ csienqu$ docker images

ccckmit

#include <stdio.h>
#include <limits.h>
#include "sha1.c"
 
void printNow() { // 印出目前時間
  time_t now = time(NULL);
  struct tm *tmNow = (struct tm*) localtime(&now);
  printf ("Current local time and date: %s", asctime(tmNow));
}
 

ccckmit

/* This code is public-domain - it is based on libcrypt 
 * placed in the public domain by Wei Dai and other contributors.
 */
// gcc -Wall -DSHA1TEST -o sha1test sha1.c && ./sha1test
 
#include <stdint.h>
#include <string.h>
#include <stdio.h>
 
/* header */

ccckmit

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

pthread_mutex_t x;
pthread_mutex_t y;

void *A(); 
void *B(); 

ccckmit

#include <stdio.h>
#include <pthread.h>

pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
#define LOOPS 100000
int counter = 0;

void *inc()
{
  for (int i=0; i<LOOPS; i++) {

ccckmit

#include <stdio.h>
#include <pthread.h>

#define LOOPS 100000
int counter = 0;

void *inc()
{
  for (int i=0; i<LOOPS; i++) {
    counter = counter + 1;