Learning from YayoDrayber from Publish, I am sharing my CodeWars Kata.
DESCRIPTION:
Given a string, you have to return a string in which each character (case-sensitive) is repeated once.
Examples (Input -> Output):
- "String" -> "SSttrriinngg"
- "Hello World" -> "HHeelllloo WWoorrlldd"
- "1234!_ " -> "11223344!!__ "
Starting code
char *double_char (const char *string, char *doubled)
{
*doubled = '\0'; // write to doubled
return doubled; // return it
}
My attempt
char *double_char (const char *string, char *doubled)
{
char *writing_head = doubled;
char *reading_head = string - 1;
while (*++reading_head) {
*writing_head++ = *reading_head;
*writing_head++ = *reading_head;
}
*writing_head = '\0';
return doubled; // return it
}
Best Practice and Clever
char *double_char (const char *string, char *doubled)
{
int k=0,i=0;
while (string[i]!='\0'){
doubled[k++]=string[i];
doubled[k++]=string[i++];
}
doubled[k]='\0';
return doubled;
}
Using index like we would in other languages is a clear way to do it.
My Pick
char *double_char (const char *string, char *doubled) {
char *result = doubled;
while(*string){
*doubled++ = *string;
*doubled++ = *string++;
}
*doubled = '\0'; // write to doubled
return result; // return it
}
So, you can use the input string pointer.
My post-Kata snippet
char *double_char (const char *string, char *doubled)
{
char *d = doubled;
while (*string) {
*d++ = *string;
*d++ = *string++;
}
*d = '\0';
return doubled; // return it
}
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