I have tried to solve some of the problems that I have faced in C-CPP development to learn in deep concepts.
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Write a parallel program using pthread to accomplish the same as the following serial program. For the following serial program, the user enters a line 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 let each thread counts the characters of its segment.
Note: Do not count the space or the tab characters.
//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");
fgets(letters, atmost+1, stdin);//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.
For solution run solutions/problem1.cpp
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