S1E2：第一个程序 | 课后测试题及答案
《带你学C带你飞》第一季视频下载地址：传送门y$Uv|KHFv!5jQRZh&_b,y.gewO9sT
测试题：版权属于：bbs.fishc.com
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0. 为什么我们说计算机其实是“二傻子”？4g<+05O
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1. CPU 唯一认识的语言是什么语言？MK}t%#@('<
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2. C 语言编写的源代码转换为汇编语言的过程叫什么？lZh%;}Umf
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3. 编译型语言和解释型语言的本质区别是什么？H2-&{Lk;G>
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4. 在 Linux 系统上用 C 语言编译的可执行程序，是否能在 Windows 系统上执行？}s.9?jZ{
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5. 解释型编程语言是如何实现跨平台的？TKu@.m fe"
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6. 莫斯密码的原理其实是什么？来自：bbs.fishc.com
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7. 视频中小甲鱼“故弄玄虚”的那段密文还原后是什么内容（中文）？RY(2Hqab0P
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动动手：来自：bbs.fishc.com
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不是说一个合格的程序员需要累积 10 万行的代码量嘛！
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那么这节课的动动手环节就让大家写一个计算代码量的程序吧~Jtg*r[
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程序要求：统计当前目录及所有子目录下，C 语言源文件的代码总行数。xyi,B%
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怎么写？？？？？？？？？？？？？？？？？？E4d*K
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{:9_230:} 来自：bbs.fishc.com
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嗯，咱现在还没开始学习任何 C 语言的语法呢，当然是让大家抄啦！！（不抄错也是一件蛮困难的事儿噢，不信你试试看~）g+j(ZGH
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这节课才刚讲 C 语言可移植性高，马上小甲鱼就给自己打脸了！对于目录扫描来说，各个操作系统还真是自成一家……所以请选择你使用的操作系统，抄下代码并编译执行程序。OvF^?
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程序可以成功执行就算过关啦~（记得截图给我看噢^_^）GaPJ,$&c
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Linux 和 MacOS：Powered by bbs.fishc.com
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#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#define MAX 256
long total;
int countLines(const char *filename);
int isCode(const char *filename);
void findAllDirs(const char *path);
int countLines(const char *filename)
{
FILE *fp;
int count = 0;
int temp;
if ((fp = fopen(filename, "r")) == NULL)
{
fprintf(stderr, "Can not open the file: %s\n", filename);
return 0;
}
while ((temp = fgetc(fp)) != EOF)
{
if (temp == '\n')
{
count++;
}
}
fclose(fp);
return count;
}
int isCode(const char *filename)
{
int length;
length = strlen(filename);
if (!strcmp(filename + (length - 2), ".c"))
{
return 1;
}
else
{
return 0;
}
}
void findAllDirs(const char *path)
{
DIR *dp;
struct dirent *entry;
struct stat statbuf;
if ((dp = opendir(path)) == NULL)
{
fprintf(stderr, "The path %s is wrong!\n", path);
return;
}
chdir(path);
while ((entry = readdir(dp)) != NULL)
{
lstat(entry->d_name, &statbuf);
if (!strcmp(".", entry->d_name) || !strcmp("..", entry->d_name))
continue;
if (S_ISDIR(statbuf.st_mode))
{
findAllDirs(entry->d_name);
}
else
{
if (isCode(entry->d_name))
{
total += countLines(entry->d_name);
}
}
}
chdir("..");
closedir(dp);
}
int main()
{
char path = ".";
printf("计算中...\n");
findAllDirs(path);
printf("目前你总共写了 %ld 行代码！\n\n", total);
return 0;
}
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Windows：版权属于：bbs.fishc.com
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#include <io.h>
#include <direct.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 256
long total;
int countLines(const char *filename);
void findAllCodes(const char *path);
void findALLFiles(const char *path);
int countLines(const char *filename)
{
FILE *fp;
int count = 0;
int temp;
if ((fp = fopen(filename, "r")) == NULL)
{
fprintf(stderr, "Can not open the file：%s\n", filename);
return 0;
}
while ((temp = fgetc(fp)) != EOF)
{
if (temp == '\n')
{
count++;
}
}
fclose(fp);
return count;
}
void findAllCodes(const char *path)
{
struct _finddata_t fa;
long handle;
char thePath, target;
strcpy(thePath, path);
if((handle = _findfirst(strcat(thePath, "/*.c"), &fa)) != -1L)
{
do
{
sprintf(target, "%s/%s", path, fa.name);
total += countLines(target);
}while (_findnext(handle, &fa) == 0);
}
_findclose(handle);
}
void findALLDirs(const char *path)
{
struct _finddata_t fa;
long handle;
char thePath;
strcpy(thePath, path);
if((handle = _findfirst(strcat(thePath, "/*"), &fa)) == -1L)
{
fprintf(stderr, "The path %s is wrong!\n",path);
return;
}
do
{
if (!strcmp(fa.name, ".") || !strcmp(fa.name, ".."))
continue;
if( fa.attrib == _A_SUBDIR)
{
sprintf(thePath, "%s/%s", path, fa.name);
findAllCodes(thePath);
findALLDirs(thePath);
}
}while (_findnext(handle, &fa) == 0);
_findclose(handle);
}
int main()
{
char path = ".";
printf("计算中...\n");
findAllCodes(path);
findALLDirs(path);
printf("目前你总共写了 %ld 行代码！\n\n", total);
system("pause");
return 0;
}
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图一时之快先看答案，你将失去一次锻炼的机会！QaLrA5qFM_
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请先自己思考和动手，再回复查看参考答案。4H`C|.[
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