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# Program to implement the least square method

Posted By: Huberta Miller     Category: C Programming     Views: 14039

## Code for Program to implement the least square method in C Programming

```#include<stdio.h>
#include "barrier.h"
#include "forkjoin.h"
#include "shared.h"int main()
{
int n, i, pid, start, size, nproc, shmid1, shmid2, sh3, sh4, sh5, sh6, *y;
int *x, *X, *XY, *X2, *Y, year;
float a, b, data;

printf("Enter the duration in years :: ");
scanf("%d",&size);

printf("Enter the starting year :: ");
scanf("%d",&start);
n=start;

y=(int *)create_memory(size*2,&shmid1);
x=(int *)create_memory(size*2, &shmid2);
X=(int *)create_memory(size*2,&sh6);
XY=(int *)create_memory(2,&sh3);
X2=(int *)create_memory(2, &sh4);
Y=(int *)create_memory(2,&sh5);

*Y=*XY=*X2=0;
for(i=0;i<size;i++)
{
x[i]=start;
printf("Enter the data for year %d :: ",x[i]);
scanf("%d",&y[i]);
start++;
}

n=(int)(x[size-1]-x[0])/2;
n=x[n];

for(i=0;i<size;i++)
X[i]=x[i]-n;

printf("Enter the total number of processes :: ");
scanf("%d",&nproc);

pid=create_process(&nproc);

for(i=pid;i<size;i+=nproc)
{
*XY += X[i]*y[i];
*X2 += (X[i])*(X[i]);
*Y += y[i];
}

join_process(&nproc,&pid);

a=(float)*XY/(*X2);
b=(float)*Y/size;

printf("The equation is y = %.2fx + %.2f",a,b);
printf("\nEnter the year for which u want the data :: ");
scanf("%d",&year);

data=a*(year-n) + b;
printf("\nFor year %d, the data value is %0.2f",year,data);

cleanup_memory(&shmid1);
cleanup_memory(&shmid2);
cleanup_memory(&sh3);
cleanup_memory(&sh4);
cleanup_memory(&sh5);
cleanup_memory(&sh6);
printf("\n");

return 0;
}

/* OUTPUT */

Enter the duration in years :: 9
Enter the starting year :: 1995
Enter the data for year 1995 :: 10
Enter the data for year 1996 :: 11
Enter the data for year 1997 :: 12
Enter the data for year 1998 :: 13
Enter the data for year 1999 :: 17
Enter the data for year 2000 :: 14
Enter the data for year 2001 :: 15
Enter the data for year 2002 :: 18
Enter the data for year 2003 :: 17
Enter the total number of processes :: 5
The equation is y = 0.93x + 14.11
Enter the year for which u want the data :: 2004

For year 2004, the data valueis 18.78             ```
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 Huberta Miller author of Program to implement the least square method is from Frankfurt, Germany. View All Articles

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