字符串的替换和反转

char LowerCaseAlphabets[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',
't','u','v','w','x','y','z'};
char UpperCaseAlphabets[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','0','P','Q','R','S',
'T','U','V','W','X','Y','Z'};
	
char GetFourthChar( char chrsource, char alphabets[])
{
     for( int i=0; i<26; i++)
	 {   
		 if( alphabets[i] == chrsource )
		 {
			 int index = (i+4)%26;
		     return alphabets[index];
		 }
	 }
	 return '/0';
}

void Replacechars( char chars[], int len)
{
	for( int i=0; i<len; i++)
	{
        if( 'a'<chars[i]&&chars[i]<'z' )
        {
            GetFourthChar(chars[i], LowerCaseAlphabets);
        }
		if( 'A'<chars[i]&&chars[i]<'Z')
		{
			GetFourthChar(chars[i], UpperCaseAlphabets);
		}
	}
}

void ReverseString( char str[], int len)
{
    int begin=0, end=len-1;
	if( str[end] == '
 
 
char LowerCaseAlphabets[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',
't','u','v','w','x','y','z'};
char UpperCaseAlphabets[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','0','P','Q','R','S',
'T','U','V','W','X','Y','Z'};
	
char GetFourthChar( char chrsource, char alphabets[])
{
     for( int i=0; i<26; i++)
	 {   
		 if( alphabets[i] == chrsource )
		 {
			 int index = (i+4)%26;
		     return alphabets[index];
		 }
	 }
	 return '/0';
}

void Replacechars( char chars[], int len)
{
	for( int i=0; i<len; i++)
	{
        if( 'a'<chars[i]&&chars[i]<'z' )
        {
            GetFourthChar(chars[i], LowerCaseAlphabets);
        }
		if( 'A'<chars[i]&&chars[i]<'Z')
		{
			GetFourthChar(chars[i], UpperCaseAlphabets);
		}
	}
}

void ReverseString( char str[], int len)
{
    int begin=0, end=len-1;
	if( str[end] == '\0')
	{
		end--;
	}
	char hold;
	while(begin<end)
	{
		hold = str[begin];
		str[begin] = str[end];
		str[end] = hold;
		begin++;
		end--;
	}
}

void Encodestring( char str[], int len)
{
     Replacechars(str, len);
	 ReverseString(str, len);
}
 
 
 
  
  

')
	{
		end--;
	}
	char hold;
	while(begin<end)
	{
		hold = str[begin];
		str[begin] = str[end];
		str[end] = hold;
		begin++;
		end--;
	}
}

void Encodestring( char str[], int len)
{
     Replacechars(str, len);
	 ReverseString(str, len);
}
char LowerCaseAlphabets[] = {'a','b','c','d','e