[转贴]打印自身的C程序

最新推荐文章于 2023-01-08 18:36:23 发布

原创最新推荐文章于 2023-01-08 18:36:23 发布 · 606 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

实现自身的打印很简单，按如下步骤实现：

1. 写好一个程序；

2. 定义一个字符串str把原来的代码抄进去；不能显示的字符和特殊字符都用%c替换，如换行、引号、

3. 用一个输出语句printf打印str。注意这里，格式控制的时候，10表示换行，34表示"，92表示/，110表示n，9表示/t。

随后附另外一个大牛写的，长一点，不过看起来清晰，思路较好：

#include <stdio.h>
#include <string.h>

char *restore(char *src)
{
        char *dest, *p;
        dest = p = new char[strlen(src) * 2];
        *p++ = *src++;
        while(*src)
        {
                switch(*src)
                {
                case 10:
                        *p++ = 92;
                        *p++ = 110;
                        *p++ = 34;
                        *p++ = 10;
                        *p++ = 9;
                        *p++ = 9;
                        *p++ = 34;
                        break;
                case 34:
                        *p++ = 92;
                        *p++ = 34;
                        break;
                default:
                        *p++ = *src;
                }
                src++;
        }
        *p = 0;
        return dest;
}

int main()
{
        char str[] =
                "#include <stdio.h>/n"
                "#include <string.h>/n"
                "/n"
                "char *restore(char *src)/n"
                "{/n"
                "       char *dest, *p;/n"
                "       dest = p = new char[strlen(src) * 2];/n"
                "       *p++ = *src++;/n"
                "       while(*src)/n"
                "       {/n"
                "               switch(*src)/n"
                "               {/n"
                "               case 10:/n"
                "                       *p++ = 92;/n"
                "                       *p++ = 110;/n"
                "                       *p++ = 34;/n"
                "                       *p++ = 10;/n"
                "                       *p++ = 9;/n"
                "                       *p++ = 9;/n"
                "                       *p++ = 34;/n"
                "                       break;/n"
                "               case 34:/n"
                "                       *p++ = 92;/n"
                "                       *p++ = 34;/n"
                "                       break;/n"
                "               default:/n"
                "                       *p++ = *src;/n"
                "               }/n"
                "               src++;/n"
                "       }/n"
                "       *p = 0;/n"
                "       return dest;/n"
                "}/n"
                "/n"
                "int main()/n"
                "{/n"
                "       char str[] = /n"
                "               /"%s/";/n"
                "       printf(str, restore(str));/n"
                "/n"
                "return 0;/n"
                "}/n"
                "";
        printf(str, restore(str));

        return 0;
}