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Write a program to read all the characters (at most 1000) from an input file named

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Question 1 (Lecture 1): Write a program to read all the characters (at most 1000) from an input file named: a.txt. The program should replace every space character by the last character.

For example if the content of the input file is:

So far the variables we had in our programs were simple variables. There are other kinds of

variables and are called structured variables.

Array variables are of this kind@

 

The output should be:

So@far@the@variables@we@had@in@our@programs

were@simple@variables.@There@are@other@kinds@of

variables@and@are@called@structured@variables.

Array@variables@are@of@this@kind@

 

Answer:

 

Question 2 (Lecture 2): Write a parallel program using the sequent simulator (sequent.h) to accomplish the same as the following serial program. For the following serial program the user enters a line of text, and the program outputs the number of occurrences of each character.

For the parallel program if we have n threads we should divide the line into n segments (and not into n characters) and let each thread counts the characters of its segment.

Note: If you get error with respect to shared memory enter the following on the prompt:

 

ipcrm -a

 

For more information on this command enter: man ipcrm.

The following is the sequential (serial) of this question.

 

//File name: a.c

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

 

#define ASCIIs 127 //ASCII characters from 0 to 127

#define atmost 1000

 

 

char letters[atmost + 1]; //Extra location for the string terminator '\0'

int count[ASCIIs];

 

int main(){

  int i, index;

 

  for(i = 0; i < ASCIIs; i++)

    count[i] = 0;

 

  printf("Enter a line not larger than 100 characters.\n");

  gets(letters); //Read a line into array letters. This function adds '\0' to the end of the string

 

  for(i = 0; i < strlen(letters); i++){

    index = (int)letters[i];

    (count[index])++;

  }

 

  for(i = 33; i <  ASCIIs; i++)

    if(count[i] != 0)

      printf("Number of %c is: %d\n", i, count[i]); 

  return 0;

}

 

For example:

 

Enter a line not larger than 100 characters.

for(i = 0; i < strlen(letters); i++){

Number of ( is: 2

Number of ) is: 2

Number of + is: 2

Number of 0 is: 1

Number of ; is: 2

Number of < is: 1

Number of = is: 1

Number of e is: 3

Number of f is: 1

Number of i is: 3

Number of l is: 2

Number of n is: 1

Number of o is: 1

Number of r is: 3

Number of s is: 2

Number of t is: 3

Number of { is: 1

 

The boldfaced line is what the user entered.

 

 

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