My CS50 Hackerrank Solutions

README.md

Hello World! My solutions to the contest are posted here!

ordinary-ordinals.c

#include <cs50.h>
#include <string.h>
#include <stdio.h>

string append_suffix(int i);

int main(void)
{

    char *data = get_string();
    const char* s = " ";
    char *token;
    int i = 1;

    if (data == NULL) 
    {
        printf("There is no box");
        return (0); // Stop the program;
    }

    token = strtok(data, s);

    while (token != NULL) 
    {
        if (strcmp(token, "cat") == 0) 
        {
            // If cat is found, don't bother checking for others;
            break;
        }

        token = strtok(NULL, s);
        i++;
    }

    //get_string() returns NULL if no string is passed;
    if (token != NULL) 
    {
        printf("The cat is the %i%s item in the box", i, append_suffix(i));
    }
    else 
    {
        printf("No cat yet");
    }


}

string append_suffix(int i) 
{
    /* Check through 14 - 98; 
       we cant have 11st, 12nd or 13rd buh 
       we can have 21th, 22nd or 23rd
     */

    if (i > 13 && i < 99) 
    {
        i = i % 10;
    }

    switch (i)
    {
        case 1:
            return "st";
        case 2:
            return "nd";
        case 3:
            return "rd";
        default:
            return "th";
    }
}

title-case.c

#include <cs50.h>
#include <ctype.h>
#include <string.h>
#include <stdio.h>

string title_case(string str);

int main(void)
{
  char* data = get_string();

  printf("%s\n", title_case(data));
}

char* concat(char *s1, char *s2)
{
  char *result = malloc(strlen(s1) + strlen(s2));
  strcpy(result, s1);
  strcat(result, s2);
  return result;
}

string title_case(string str)
{
  char* result = "";
  char* del = " ";
  char* token = strtok(str, del);
  int i = 0;

  while(token != NULL)
  {
    if (i == 0)
    {
      token[0] = toupper(token[0]);
    }

    if (
      strcmp(token, "the") != 0 &&
      strcmp(token, "of") != 0 &&
      strcmp(token, "and") != 0 &&
      strcmp(token, "but") != 0
    )
    {
      token[0] = toupper(token[0]);  
    }

    result = concat(result, token);
    result = concat(result, " ");
    token = strtok(NULL, del);
    i++;
  }

  return result;
}