厦大小学期C语言程序设计实践（二）
所有实践项目的源程序可到我的Github上下载：https://github.com/liulizhi1996/C-Programming-Practice-in-short-semester
任务一：颠倒的世界
小明最近突然喜欢倒着写字，写出来的句子全是颠倒的，也就是把一句话里的字符全都逆序写，譬如“I Love This Game！”，他就偏偏要写成“!emaG sihT evoL I”弄的小华同他Email交流都很难受。请你帮助小华解决这个问题，将输入的字符串全都还原成本来的面目。
任务1要求：
利用main函数带参数的功能，编写程序，将命令行中的字符串全部逆序显示出来。例如编写的可执行文件为go.exe 那么运行 go !emaG sihT evoL I 时，显示出I Love This Game！
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv)
{
if (argc <= 1)
{
perror("usage: ./reverse.out \n");
}
int len;
for (int i = argc-1; i > 0; --i)
{
len = (int)strlen(argv);
for (int j = len-1; j >= 0; --j)
printf("%c", argv);
printf(" ");
}
printf("\n");
return 0;
}
任务二：时间转换
由于工作原因，小明常常需要签署文件日期，但他比较偷懒，都用阿拉伯数字签署，譬如3.8表示三月八日，7.12表示七月十二日。最近公司改组成外资企业，主管要求将所有的日期全部更改为英文表示，一来同国际接轨，二来也不容易篡改，譬如将3.8表示为March the eighth 面对这么多的日期，小明犯愁了，他英文不好，那么多的英文单词他记不住。而且小明还是个马大哈，有时候居然会签出3.32（三月三十二日）这样的日期，为了避免被上司责备，趁着这次机会也赶快一并修改。请你帮助小明完成这个任务。
任务2要求：
利用main函数带参数的功能，编写程序，将命令行中的字符串翻译成英文表示，每行显示一个日期，同时需检查日期表示是否有误，如有误，请给出提示。例如：编写的可执行文件为go.exe 那么运行go 3.8 5.5 4.38 时显示
March the eighth
May the fifth
Error
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int days[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
char english_months[] = {"", "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"};
char english_days[] = {"", "first", "second", "third", "fourth", "fifth", "sixth", "seventh",
"eighth", "ninth", "tenth", "eleventh", "twelfth", "thirteenth",
"fourteenth", "fifteenth", "sixteenth", "seventeenth", "eighteenth",
"nineteenth", "twentieth", "twenty-first", "twenty-second", "twenty-third",
"twenty-fourth","twenty-fifth", "twenty-sixth", "twenty-seventh",
"twenty-eighth", "twenty-ninth", "thirtieth", "thirty-first"};
int main(int argc, char **argv)
{
if (argc <= 1)
{
perror("usage: ./date.out \n");
}
int month, day, is_legal, j;
for (int i = 1; i < argc; ++i)
{
is_legal = 1;
month = 0;
for (j = 0; argv && argv != '.'; ++j)
{
if ('0' <= argv && argv <= '9')
month = month * 10 + (argv - '0');
else
{
is_legal = 0;
break;
}
}
if (!is_legal)
{
printf("Error\n");
continue;
}
day = 0;
for (j++; argv; ++j)
{
if ('0' <= argv && argv <= '9')
day = day * 10 + (argv - '0');
else
{
is_legal = 0;
break;
}
}
if (!is_legal)
{
printf("Error\n");
continue;
}
if (1 <= month && month <= 12)
{
if (1 <= day && day <= days)
printf("%s the %s\n", english_months, english_days);
else
{
printf("Error\n");
continue;
}
}
else
{
printf("Error\n");
continue;
}
}
return 0;
}
任务三：时间转换(续)
小明觉得这么一点点的手工输入还是有点麻烦，他把需要翻译的日期都整理到文本文件in.txt中，请你帮助小明，将其中的内容翻译完毕后保存到文本文件out.txt中，便于他统一处理。
任务3要求：翻译过程同任务2，将结果保存至文件out.txt中
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int days[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
char english_months[] = {"", "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"};
char english_days[] = {"", "first", "second", "third", "fourth", "fifth", "sixth", "seventh",
"eighth", "ninth", "tenth", "eleventh", "twelfth", "thirteenth",
"fourteenth", "fifteenth", "sixteenth", "seventeenth", "eighteenth",
"nineteenth", "twentieth", "twenty-first", "twenty-second", "twenty-third",
"twenty-fourth","twenty-fifth", "twenty-sixth", "twenty-seventh",
"twenty-eighth", "twenty-ninth", "thirtieth", "thirty-first"};
int main(int argc, char **argv)
{
if (argc <= 1)
{
perror("usage: ./datefile.out \n");
}
FILE *fp_in = fopen("in.txt", "w");
FILE *fp_out = fopen("out.txt", "w");
int month, day, is_legal, j;
for (int i = 1; i < argc; ++i)
{
fprintf(fp_in, "%s\n", argv);
is_legal = 1;
month = 0;
for (j = 0; argv && argv != '.'; ++j)
{
if ('0' <= argv && argv <= '9')
month = month * 10 + (argv - '0');
else
{
is_legal = 0;
break;
}
}
if (!is_legal)
{
fprintf(fp_out, "Error\n");
continue;
}
day = 0;
for (j++; argv; ++j)
{
if ('0' <= argv && argv <= '9')
day = day * 10 + (argv - '0');
else
{
is_legal = 0;
break;
}
}
if (!is_legal)
{
fprintf(fp_out, "Error\n");
continue;
}
if (1 <= month && month <= 12)
{
if (1 <= day && day <= days)
fprintf(fp_out, "%s the %s\n", english_months, english_days);
else
{
fprintf(fp_out, "Error\n");
continue;
}
}
else
{
fprintf(fp_out, "Error\n");
continue;
}
}
fclose(fp_in);
fclose(fp_out);
return 0;
}
文档来源：51CTO技术博客https://blog.51cto.com/liulizhi1996/3034009
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