Question

PROGRAM DESCRIPTION:
In this assignment, you are provided with working code that does the following:
1. You input a sentence (containing no more than 50 characters).
2. The program will read the sentence and put it into an array of characters.
3. Then, it creates one thread for each character in the sentence.
4. The goal of the program is to capitalize on each letter that has an odd index.
The given program actually does this but lacks the synchronization of the threads, so
the output is not correct. You will need to provide the synchronization using mutex
locks. Specifically, you are to (1) declare the mutex lock, (2) initialize the mutex lock, (3)
lock and unlock the mutex lock at an appropriate location that results in the code
working as expected, and (4) destroy the mutex lock. Be sure to place the mutex locks
so that your program works correctly every time. Do not remove code or functions – you
are to add the synchronization pieces only.
When compiling using the GNU C compiler, be sure to include the –lpthread flag
option.
SAMPLE OUTPUT (user input shown in bold green):
$ ./a.out
Please enter a phrase (less than 50 characters): when all else
fails, read the instructions
The original sentence is: when all else fails, read the instructions
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [3]: N
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [0]: w
The new sentence is [9]: E
The new sentence is [12]: e
The new sentence is [14]: f
The new sentence is [15]: A
The new sentence is [16]: i
2
The new sentence is [17]: L
The new sentence is [17]: L
The new sentence is [19]: ,
The new sentence is [20]:
The new sentence is [21]: R
The new sentence is [22]: e
The new sentence is [23]: A
The new sentence is [23]: A
The new sentence is [25]:
The new sentence is [26]: t
The new sentence is [27]: H
The new sentence is [27]: H
The new sentence is [27]: H
The new sentence is [29]:
The new sentence is [31]: N
The new sentence is [30]: i
The new sentence is [31]: N
The new sentence is [32]: s
The new sentence is [35]: U
The new sentence is [34]: r
The new sentence is [35]: U
The new sentence is [36]: c
The new sentence is [37]: T
The new sentence is [39]: O
The new sentence is [41]: S
The new sentence is [41]: S
The problem is that the output should look something like:
$ ./a.out
Please enter a phrase (less than 50 characters): when all else
fails, read the instructions
The original sentence is: when all else fails, read the instructions
The new sentence is [0]: w
The new sentence is [1]: H
The new sentence is [2]: e
The new sentence is [3]: N
The new sentence is [4]:
The new sentence is [5]: A
The new sentence is [6]: l
The new sentence is [7]: L
The new sentence is [8]:
The new sentence is [9]: E
The new sentence is [10]: l
The new sentence is [11]: S
The new sentence is [12]: e
The new sentence is [13]:
The new sentence is [14]: f
The new sentence is [15]: A
The new sentence is [16]: i
The new sentence is [17]: L
3
The new sentence is [18]: s
The new sentence is [19]: ,
The new sentence is [20]:
The new sentence is [21]: R
The new sentence is [22]: e
The new sentence is [23]: A
The new sentence is [24]: d
The new sentence is [25]:
The new sentence is [26]: t
The new sentence is [27]: H
The new sentence is [28]: e
The new sentence is [29]:
The new sentence is [30]: i
The new sentence is [31]: N
The new sentence is [32]: s
The new sentence is [33]: T
The new sentence is [34]: r
The new sentence is [35]: U
The new sentence is [36]: c
The new sentence is [37]: T
The new sentence is [38]: i
The new sentence is [39]: O
The new sentence is [40]: n
The new sentence is [41]: S
The new sentence is [42]:
REQUIREMENTS:
• No comments are required for this recitation assignment, except for your name at
the top of each program.
• Your program should be named “rec07.c”, without the quotes.
• Your program will be graded based largely on whether it works correctly on the
CSE machines (e.g., cse01, cse02, …, cse06), so you should make sure that
your program compiles and runs on a CSE machine.
• Although this assignment is to be submitted individually (i.e., each student will
submit his/her own source code), you may receive assistance from your TA and
even other classmates. Please remember that you are ultimately responsible for
learning and comprehending this material as the recitation assignments are given
in preparation for the minor assignments, which must be completed individually.
• Please do not share this assignment or your work with other students to allow
them the opportunity to benefit from this exercise and learn this material.
SUBMISSION:
• You will electronically submit your program to the Recitation 7 dropbox in
Canvas by the due date and time. No late recitation assignments will be
accepted.

CODE

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

#define SIZE 50

char sentence[2000];
int ind = 0;

char convertUppercase(char lower)
{
//Converts lowercase un uppercase
if ((lower > 96) && (lower < 123))
{
return (lower - 32);
}
else
{
return lower;
}
}

void printChar()
{
//prints the converted sentence
printf("The new sentence is [%d]: \t%c\n", ind, sentence[ind]);
ind++;
}

void *convertMessage(void *ptr)
{
// Function that each threads initiates its execution
if (ind % 2)
{
sentence[ind] = convertUppercase(sentence[ind]);
}
  
printChar();

return 0;
}

int main()
{
int i;
char buffer[SIZE];
char *p;
pthread_t ts[SIZE]; // define up to 50 threads

printf("Please enter a phrase (less than 50 characters): ");

if (fgets(buffer, sizeof(buffer), stdin) != NULL)
{
if ((p = strchr(buffer, '\n')) != NULL)
{
*p = '\0';
}
}

strcpy(sentence, buffer); // copy string to char array
  
printf("The original sentence is: \t %s\n", sentence);

// create one thread for each character on the input word
for (i = 0; i < strlen(buffer) + 1; ++i)
{
pthread_create(&ts[i], NULL, convertMessage, NULL);
}
  
// we wait until all threads finish execution
for (i = 0; i < strlen(buffer); i++)
{
pthread_join(ts[i], NULL);
}
  
printf("\n");
  
return 0;
}

Answer 1

SOLUTION-
I have solve the problem in C code with comments and screenshot for easy understanding :)

CODE-

#include <stdio.h>
#include <string.h>
#include <pthread.h>
#define SIZE 50
char sentence[2000];
int ind = 0;
pthread_t tid[50];
int counter;
pthread_mutex_t lock;
char convertUppercase(char lower)
{
//Converts lowercase un uppercase
if ((lower > 96) && (lower < 123))
{
return (lower - 32);
}
else
{
return lower;
}
}

void printChar()
{
//prints the converted sentence
printf("The new sentence is [%d]: \t%c\n", ind, sentence[ind]);
ind++;
}

void convertMessage(void ptr)
{
pthread_mutex_lock(&lock);
// Function that each threads initiates its execution
if (ind % 2)
{
sentence[ind] = convertUppercase(sentence[ind]);
}
printChar();
pthread_mutex_unlock(&lock);
return 0;
}

int main()
{
int i;
char buffer[SIZE];
char *p;
pthread_t ts[SIZE]; // define up to 50 threads
printf("Please enter a phrase (less than 50 characters): ");
if (fgets(buffer, sizeof(buffer), stdin) != NULL)
{
if ((p = strchr(buffer, '\n')) != NULL)
{
*p = '\0';
}
}
strcpy(sentence, buffer); // copy string to char array
printf("The original sentence is: \t %s\n", sentence);
// create one thread for each character on the input word
for (i = 0; i < strlen(buffer) + 1; ++i)
{
pthread_create(&ts[i], NULL, convertMessage, NULL);
}
// we wait until all threads finish execution
for (i = 0; i < strlen(buffer); i++)
{
pthread_join(ts[i], NULL);
}
printf("\n");
pthread_mutex_destroy(&lock);
return 0;
}

OUTPUT :

IF YOU HAVE ANY DOUBT PLEASE COMMENT DOWN BELOW I WILL SOLVE IT FOR YOU:)
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