C

• 

  Argument for getc to check for EOF is not working.
  • Rachel O  

  4
  4
  Posts
  175
  Views

  

  Hey @Rachel-O

  I finally figured it out. Sorry, it took me a while. I am not a C developer. But anyways, I have the answer in video format. Check it out. I also included the code down below in case you don't want to watch the video version and just want the answer.

  Let me know if you have any questions or if I can be of further help.

  https://youtu.be/8r_9LN0k-Xc

  #include <stdio.h> #include <stdlib.h> #include <string.h> // Include boolean #include <stdbool.h> int main(int argc, char *argv[]) { // Global variables FILE *input, *output; char c; int sentenceCounter=1,wordCounter=0; // Will be set to true whenever we encounter a period bool newSentence = true; // Make sure input and output files are specified if (argc < 3) { fprintf (output, "\nCorrect usage is: ./mimir.out <name of input file> <name of output file>\n\n"); exit(EXIT_FAILURE); } // Make sure we can open input file if((input = fopen(argv[1], "r")) == NULL) { fprintf (output, "\nUnable to open input file \"%s\".\n\n", argv[1]); exit(EXIT_FAILURE); } // Let's start the process else { // Open output stream output=fopen(argv[2],"w"); // START READING INPUT FILE HERE c = getc(input); // As long as we have not reached the end of the input file while (c != EOF) { // New line marker? if(newSentence){ fprintf (output, "Sentence # %d\n",sentenceCounter++); fprintf (output, "--------------------------------------------------------------------------------\n"); newSentence = false; } // Process a single word while (c != ' ' && c != '\n' && c != ',' && c != '.'){ fprintf(output,"%c", c); c = getc(input); } // We have reached a new line, comma, space or period. So a new word. wordCounter++; // Period encountered. Set new sentence marker if(c == '.'){ newSentence = true; fprintf(output,"\n\n"); } // Have we reached 10 words yet? If so hit a new line. No comma needed. if(wordCounter == 10){ fprintf(output,"\n"); } // Otherwise comma is needed. else if(c == ' ' || c == ',' || c == '\n'){ fprintf(output,", "); } // Reset word counter? if(newSentence || wordCounter == 10){ wordCounter = 0; } // Consume empty space, period, comma and new line while (c == ' ' || c == '.' || c == ',' || c == '\n'){ c = getc(input); } } // End while c != EOF } fclose(input); return 0; }
• 

  DATA STRUCTURES IN C
  • KNV  

  1
  1
  Posts
  100
  Views

  No one has replied

• 

  Write algorithms to add and delete elements from either end of the deque.
  • Shavy Gaming  

  2
  2
  Posts
  643
  Views

  

  Hey @Shavy-Gaming

  I don't know C but with a little bit of googling I was able to find a Java implementation of a deque using a one-dimensional array.

  Here is the link:

  https://codereview.stackexchange.com/questions/120722/array-based-deque-in-java

  Here is the solution found on the page. You might be able to understand it enough to implement a C version of it. Keep in mind the main method just tests the Deque in this case. Good luck!

  import java.util.NoSuchElementException; import java.util.Random; public class Deque { private final int arr[]; private int head; private int size; public Deque(int capacity) { arr = new int[capacity]; } public void addLast(int element) { checkCapacity(); arr[(head + size++) % arr.length] = element; } public void addFirst(int element) { checkCapacity(); if (head == 0) { arr[(head = arr.length - 1)] = element; } else { arr[(--head) % arr.length] = element; } size++; } public int removeFirst() { checkNotEmpty(); int ret = arr[head]; head = (head + 1) % arr.length; size--; return ret; } public int removeLast() { checkNotEmpty(); int ret = arr[(head + size - 1) % arr.length]; size--; return ret; } @Override public String toString() { StringBuilder sb = new StringBuilder("["); for (int i = 0; i < size; ++i) { sb.append(arr[(head + i) % arr.length]); if (i < size - 1) { sb.append(", "); } } return sb.append("]").toString(); } public int size() { return size; } private void checkCapacity() { if (arr.length == size) { throw new IllegalStateException("No more space is available."); } } private void checkNotEmpty() { if (size == 0) { throw new NoSuchElementException("Trying to pop an empty deque."); } } public static void main(String args[]) { Deque deque = new Deque(10); Random random = new Random(); for (int op = 0; op < 30; ++op) { if (deque.size() == 0) { int num = random.nextInt(100); System.out.print("Adding " + num + " to front: "); deque.addLast(num); System.out.println(deque); } else { boolean add = random.nextBoolean(); if (add) { boolean front = random.nextBoolean(); int num = random.nextInt(100); if (front) { System.out.print("Adding " + num + " to front: "); deque.addFirst(num); System.out.println(deque); } else { System.out.print("Adding " + num + " to back: "); deque.addLast(num); System.out.println(deque); } } else { boolean front = random.nextBoolean(); if (front) { System.out.print("Removing from front: "); deque.removeFirst(); System.out.println(deque); } else { System.out.print("Removing from back: "); deque.removeLast(); System.out.println(deque); } } } } } }
• 

  why this code is not giving o/p as 3?
  • AshutoshxxTeotia  

  2
  2
  Posts
  62
  Views

  

  Hey @AshutoshxxTeotia

  How about something like this

  main(); int main() { printf("%d",tried(1,2)); } void tried(int a,int b) { int c=a+b; return c; }
• 

  To write a C program that will add elements of array using 3 child processes and a parent
  linux c programming system calls fork unix • • darkpandawarrior  

  2
  2
  Posts
  56
  Views

  

  Hi @darkpandawarrior

  I have never done real programming in C but let's see if I can point you in the right direction. You are probably going to end up using global static variables

  static int *sum_10;

  So declare those outside of the main method.
  Then you will probably end up using mmap so something like

  sum_10 = mmap(NULL, sizeof *sum_10, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);

  Then initialize each global variable somewhere in main

  *sum_10 = 0;

  Now you you have a set of global variables that can be shared with all processes which is the real challenge in this assignment.

  Hope you figure it out. Let me know if you need more help.

• L

  Function (split_string_at_index) given string & index , can't figure out how pass back to main after splitting into source_left and right
  • learntocode  

  7
  7
  Posts
  90
  Views

  L

  Thanks again and I will do that.