C Programming

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有兴趣的人儿 可以用Advanced C里的第一个程序转转

代码如下：

#include

#include

char decode (char letter);

void main (int argc, char *argv[])

{ char element,code;

FILE *indata, *outdata;
if (argc!=3 && argv[0]!="decode" )

{ printf ("Please enter like this: decode ** **"); exit(1); }

indata=fopen (argv[1],"r");

outdata=fopen (argv[2],"w");

if (indata==NULL) { printf ("File no found"); exit(1); }

while (fscanf(indata,"%c",&element)==1) { code=decode (element); fprintf (outdata,"%c",code); } }

char decode (char letter)

{ if (letter>='A' &&amp;amp; letter<='Z') return ((letter-2*'A'+'K')%26 + 'A');

else if (letter>='a' &&amp;amp; letter<='z') return ('z'+'a'-letter);

else return (letter); }