Question

void Translating(const char set1[], char set2[])
{

    size_t q;
    int s;
    int c;
    unsigned char table[256];

   /*Creates a table to reference characters 
     by their ACII values based on,  
     their integer values in the ASCII table.*/

   for(s = 0; s < 256; s++)
   {
       table[s] = s;

#if 1
       /*Something is occurring here. 
         The values are not returning equal to*/ 
       /*what they should be.*/
       for(q = 0; set1[q] !='\0'; q++)
       {
           if(set2[q] != set1[q])
           table[(int)set1[q]] = set2[q];
       }
#endif

       while((c = getchar()) != EOF)
       {
           putchar(table[c]);
       }
   }
}

在这段代码下面，我有一个工作用户界面（粗略的），它从命令行参数中提取值并将它们保存到set1和set2。这些值通常是一个字符数组（我测试过它们正在被正确复制）。这些字符需要传递给此函数并进行翻译。

For example: `./a asd fgt < test.txt > grr.txt`

这将读入文本文件test并更改

all 'f' with 'a', 
all 'g' with 's' and 
all 't' with 'd'.

我的功能非常接近工作，但是当我使用它时，我打印的值很疯狂。好像我的ASCII表增加了一些随机值，如100或其他东西。感谢您的时间，如果有人帮助，任何人都应该尝试这个程序，这是有趣和具有挑战性的。也许我需要为我的变量重置某个值，C是一个棘手的野兽。

Answer 1

   for(s = 0; s < 256; s++)
   {
       table[s] = s;
   }
   for(q = 0; set1[q] !='\0'; q++)
   {
       if(set2[q] != set1[q])
       table[(int)set1[q]] = set2[q];
   }
   while((c = getchar()) != EOF)
   {
       putchar(table[c]);
   }

put both inner `for` and `while` outside the outer `for` loop.

 - First you update the table with all the character list
 - change the character list to your needs.
 - Used the modified character code to print the output.

从Unix系统创建tr程序的简化版本。翻译字符功能

1 个答案: