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# Write a C or C++ program A6p2.c(pp) that accepts one command line argument which is an integer n between 2 and 4 inclusi...

Write a C or C++ program A6p2.c(pp) that accepts one command line argument which is an integer n between 2 and 4 inclusive. Generate 60 random integers between 1 and 49 inclusive and store them in a 5 by 12 two dimensional integer array (e.g.,int a[5][12];). Use pthread to create n threads to square all 60 array elements. You should divide this update task among the n threads as evenly as possible. Print the array both before and after the update separately as 5 by 12 matrices.

## Solutions

##### Expert Solution

#include <iostream>
#include <cstdlib>

using namespace std;

#define COLS 12
#define ROWS 5

int chunkSize;
int n=0;
int arr[ROWS][COLS] ;
long tid;

int start = tid * chunkSize;
int end=start+chunkSize-1;

for(int i=0; i<ROWS; i++){

for(int j=0;j<COLS;j++){

int position = i*COLS + j;

if(position>=start&&position<=end)
{
arr[i][j]=arr[i][j]*arr[i][j];
}
}

}

}

int main () {

cin>>n;
int rc;
int i,j,k;

//fill array wil data
for(i=0;i<ROWS;i++)
{
for(j=0;j<COLS;j++)
{
arr[i][j]=(rand() % 49) + 1;
}
}

//Printing Random Array
for(i=0;i<ROWS;i++)
{
cout<<"\n";
for(j=0;j<COLS;j++)
{
cout<<arr[i][j]<<"\t";
}
}

chunkSize = (60 + n - 1) / n; // divide by threads rounded up.

for( i = 0; i < n; i++ ) {
cout << "\nmain() : creating thread, " << i << endl;

if (rc) {
cout << "Error:unable to create thread," << rc << endl;
exit(-1);
}
}
//Printing Resulter Array
for(i=0;i<ROWS;i++)
{
cout<<"\n";
for(j=0;j<COLS;j++)
{
cout<<arr[i][j]<<"\t";
}
}
}

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