UVa OJ 458

 The Decoder 

Write a complete program that will correctly decode a set of characters into a valid message. Your program should read a given file of a simple coded set of characters and print the exact message that the characters contain. The code key for this simple coding is a one for one character substitution based upon a single arithmetic manipulation of the printable portion of the ASCII character set.

Input and Output

For example: with the input file that contains:

1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu5
1PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5
1KLJ'pz'{ol'{yhklthyr'vm'{ol'Kpnp{hs'Lx|pwtlu{'Jvywvyh{pvu5

your program should print the message:

*CDC is the trademark of the Control Data Corporation.
*IBM is a trademark of the International Business Machine Corporation.
*DEC is the trademark of the Digital Equipment Corporation.

Your program should accept all sets of characters that use the same encoding scheme and should print the actual message of each set of characters.

Sample Input

1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu5
1PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5
1KLJ'pz'{ol'{yhklthyr'vm'{ol'Kpnp{hs'Lx|pwtlu{'Jvywvyh{pvu5

Sample Output

*CDC is the trademark of the Control Data Corporation.
*IBM is a trademark of the International Business Machine Corporation.
*DEC is the trademark of the Digital Equipment Corporation.

 #include <stdio.h>
 #include <string.h>
 #define maxn 10000
 int main()
 {
 #ifdef CLOCK
     freopen("data.in", "r", stdin);
     freopen("data.out", "w", stdout);
 #endif
     int i;
 #ifdef LOCAL
     FILE * fin,* fout;
     fin = fopen("data.in", "rb");
     fout = fopen("data.out", "wb");
 #endif
     char buf[maxn];
     memset(buf, , sizeof(buf));
     while (fgets(buf, sizeof(buf), stdin))
     {
         for (i = ; i < strlen(buf); i++)
             buf[i] -= ;
         buf[i - 1] = '\0';
         printf("%s\n", buf);
     }
 #ifdef LOCAL
     fclose(fin);
     fclose(fout);
 #endif
     return ;
 }

报告：还是比较顺的解决了，只是其中因为\r\n的问题纠结一下，strlen的长度实际是指到'\0'，且包括\n，即题中buf[i]为'\0',buf[i-1]为'\n'。而当用到fprintf时，printf("%s\n", buf);改为fprintf("%s\r\n", buf);即后面需要加上\r\n来实现换行。

问题：无

解决：无