DDD, C (gcc) - rextester

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/** 
 * CSCA48 Summer 2020 
 * Exercise 1 - Fun with strings!
 *  
 * Please read the comments below carefully, they describe your task in detail. 
 * Any clarifications and corrections will be posted to Piazza so please keep 
 * an eye on the forum!
 * 
 * Starter code: Mustafa Quraish, 2020
 */

#include <stdio.h>
// NO additional imports allowed. You *can* make helper functions, and in fact I strongly
// encourage doing so to make your life easier.

// Maximum length of a string
#define MAX_STRING_LEN 1024

int lengthy(char input[MAX_STRING_LEN])
{
  int count = 0;
  for (int i=0; i<MAX_STRING_LEN; i++)
  {
    if (input[i] != '\0')
    {
      count ++;
    }
    else 
    {
      return count;
    }
  }
  return count;

}

//-----------------------------------------------------------------------------

void replaceSubstring(char str[], char a[], char b[]) {
  /**
   * If `a` is a substring of `str`, then the first occurence of `a` in `str`
   * is replaced with `b`.
   *
   * For example:
   *
   *    char str[50] = "Hello World!";
   *    replaceSubstring(str, "llo W", "---");
   *    printf("%s\n", str);
   *
   * should print out "He---orld!"
   *
   * You may assume that `str[]`` has enough space to store the modified string.
   * Remember that all the strings here all null-terminated, and you must
   * also null-terminate the modified string.
   */
  int i=0;
  int start_index=0;
  int end_index=0;
  int occur=0;
  char str2[MAX_STRING_LEN];
  str2[lengthy(str)]='\0';
  for (int b=0;b<lengthy(str);b++)
  {
    str2[b]=str[b];
  }
  while(str[i]!='\0')
  {
    if(str[i]==a[0])
    {
      int k=0;
      int counter=0;
      while(a[k]!='\0')
      {
        if (str[i+k]==a[k])
        {
          counter++;
          if (counter==lengthy(a))
          {
            occur++;
            start_index=i;
            end_index=i+k;
            if(occur==1)
              {
                for (int p=0;p<start_index;p++)
              {
                str[p]=str[p];
              }
              int count=0;
              for (int m=start_index;m<lengthy(b)+start_index;m++)
              {
                str[m]=b[count];
                count++;
              }
              int n=0;
              while(str2[end_index+n]!='\0')
              {
                str[start_index+n+lengthy(b)]=str2[end_index+n+1];
                str[start_index+lengthy(b)+end_index]='\0';
                n++;
              }

}
            
          }
        }
        k++;
      }
    }
    i++;
  }
  
  return;  // Not returning anything. `str` is modified directly.
}

void changeSubstringCase(char str[], char a[]) {
  /**
   * If `a` is a substring of `str`, then change the case (capitalization) of
   * the first occurence of the corresponding substring in `str`. Special 
   * characters (' ', '.', ...) do not need to be handled. You should only 
   * change the letters.
   *
   * For example:
   *
   *    char str[100] = "This IS a SENTence WITH BAd CAPITalizaTION";
   *    changeSubstringCase(str, "IS a SENTence WI");
   *    printf("%s\n", str);
   *
   * should print out "This is A sentENCE wiTH BAd CAPITalizaTION".
   */
  int i=0;
  int start_index=0;
  int end_index=0;
  int occur=0;
  char str2[MAX_STRING_LEN];
  str2[lengthy(str)]='\0';
  for (int b=0;b<lengthy(str);b++)
  {
    str2[b]=str[b];
  }
  while(str[i]!='\0')
  {
    if(str[i]==a[0])
    {
      int k=0;
      int counter=0;
      while(a[k]!='\0')
      {
        if (str[i+k]==a[k])
        {
          counter++;
          if (counter==lengthy(a))
          {
            occur++;
            start_index=i;
            end_index=i+k;
            if(occur==1)
            {
              for (int p=0;p<start_index;p++)
              {
                str[p]=str[p];
              }
              int count=0;
              for (int m=start_index;m<lengthy(a)+start_index;m++)
              {
                if (str2[m]>='a'&& str2[m]<='z')
                {
                  str[m]=str2[m]-32;
                }
                else if (str2[m]>='A'&& str2[m]<='Z')
                {
                  str[m]=str2[m]+32;
                }
                int n=0;
                while(str2[end_index+n]!='\0')
                {
                  str[start_index+n+lengthy(a)]=str2[end_index+n+1];
                  str[start_index+lengthy(a)+end_index]='\0';
                  n++;
                }
              }

}
          }
        }
        k++;
      }
    }
    i++;
  }
  
  return;  // Not returning anything. `str` is modified directly.
}

//-----------------------------------------------------------------------------

// Do not change the lines above and below the main function. These
// are here to ensure that the main() function defined here does not
// Conflict with the automarker when testing your code. Changing them
// will result in a 0 for this exercise. You are free to change anything
// inside the main() function itself.
#ifndef __testing__
int main() {
  char str[MAX_STRING_LEN] = "CSCA48 Exercise 1";
  char str2[MAX_STRING_LEN] = "Hello World!";

// This should replace the substring:
  replaceSubstring(str, "A48 Ex", "A48 sUMMER 2020 Ex");

// This should NOT replace anything, since some of the letters
  // in `a` have a different capitalization than in the string, so it is
  // NOT a valid substring.
  replaceSubstring(str, "summer 2020", "Winter 2020");

// This should change the capitalization of the substring:
  changeSubstringCase(str, "sUMMER 2020");

// This should NOT change the capitalization, since the corresponding letters
  // in `a` are lowercase, and it is not a valid substring.
  changeSubstringCase(str, "csca48");

printf("Expected result: \"CSCA48 Summer 2020 Exercise 1\"\n");
  printf("  Your solution: \"%s\"\n", str);
  return 0;
}
#endif

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Compilation time: 0.22 sec, absolute running time: 0.16 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,55 sec