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double SumArray ( double [ ], int );
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define SQUARE(x) ((x)*(x))
// Defing a specific format for the listing instead of using
// multiple tabs
#define W "15"
#define Z "14"
#define U "%"Z"s"
#define S "%"W"s"
#define F1 "%"W".1f"
#define F2 "%"W".2f"
/* SumArray is a fonction that calculates the sum of any
array when it is called */
#include "rent.h"
double SumArray (double a[], int n)
{
int c;
double sum = 0;
for (c = 0; c < n; c++)
{
sum += a[c];
}
return sum;
}
#include "rent.h"
int main (void)
{
// Two arrays that are the ones provided from the file
double filearray1[14], filearray2[14],
// Three arrays to store in them further calculations
filearray3[14], filearray4[14],
filearray5[14];
// Setting counter to 0
size_t r = 0;
FILE *fp;
// File that we will read from
char fname[] = "rent2.dat";
if ((fp = fopen (fname, "r")) == NULL)
{
printf ("Unable to open %s.\n", fname);
exit (1);
}
printf (S S "\n", "Rent","Income");
printf (U U U U U "\n", "X","Y","X^2","Y^2","XY");
while (r < (sizeof filearray1/sizeof *filearray1 )
&& fscanf (fp, "%lf%lf\n", &filearray1[r], &filearray2[r]) != EOF)
{
// The three arrays which contain calculations:
// Squaring the first array read and storing it in another one
filearray3[r] = SQUARE (filearray1[r]);
// Doing the same thing with the second one
filearray4[r] = SQUARE (filearray2[r]);
// Product of the first two arrays
filearray5[r] = filearray1[r] * filearray2[r];
// Priting everything
printf (F1 F1 F2 F2 F2 "\n",
filearray1[r], filearray2[r], filearray3[r],
filearray4[r], filearray5[r]);
r++;
}
// Summing all the arrays and storing results
// in new double variables so that further
// will be easier
double SumX = SumArray (filearray1,r),
SumY = SumArray (filearray2,r),
SumXX = SumArray (filearray3,r),
SumYY = SumArray (filearray4,r),
SumXY = SumArray (filearray5,r);
printf (S S S S S "\n", "------","--------","---------","-------------","-----------");
// Printing the total at the end of each array
printf (F1 F1 F1 F1 F1"\n", SumX, SumY, SumXX, SumYY, SumXY);
printf("\n\n\t\t\t Press ENTER to Continue");
getchar();
/* Coefficient of correlation calculations */
// Number of elements contained in each array
int N = 14;
// Variable of the coefficient
double coef;
// Declaring two others so that the formula is easier
double coef1, coef2;
// Calculation of the coefficient using formula provided
coef1 = N*SumXY - (SumX)*(SumY);
coef2 = sqrt((N*SumXX - SumX*SumX)*(N*SumYY - SumY*SumY));
coef = coef1/coef2;
printf ("\n\n\t +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ ");
printf ("\n\t | Coefficient of correlation is: | ");
printf ("\n\t | r = + %.2lf | ", coef);
printf ("\n\t +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ \n");
/* Regression equations calculation */
// Variables needed for the equation
double a, b, b1, b2, avgX, avgY;
// Averaging X and Y
avgX = SumX/N;
avgY = SumY/N;
// Calculating b
b1 = SumXY - N*avgX*avgY;
b2 = SumXX - N*avgX*avgX;
b = b1/b2;
// Calculating a
a = avgY - b*avgX;
// Plugging a and b and priting the equation
printf("\n\t Regression equation is: \n");
printf("\t =-=-=-=-=-=-=-=-=-=-=-= \n");
printf("\n\t Yc = a + bX = %.2lf + %.2lfX\n", a, b);
printf("\n\t( a = %.6lf , b = %.6lf )\n\n", a, b);
/* Stand error of estimate */
double Sy;
Sy = (SumYY - (a*SumY + b*SumXY))/N;
Sy = sqrt (Sy);
printf("\t +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+ ");
printf("\n\t | The Standard error of estimate: |");
printf("\n\t | Sy = +/- $%.2lf |", Sy);
printf("\n\t +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+\n");
printf("\n\t\t\t Press ENTER to continue \n");
getchar();
// Variables needed for prediction of the income
double rent, choice, income, lower, upper;
do
{
printf("\n\nEnter a rent amount (to quit enter 0) : ");
scanf("%lf", &rent);
if(rent > 0)
{
income = a + (b*rent);
lower = income - Sy;
upper = income + Sy;
printf("\n\n\t Rent \t\t Lower Limit \t Predicted Income \t Upper Limit \n");
printf("\n\t$ %.2lf \t %.2lf \t %.2lf \t\t %.2lf \n", rent, lower, income, upper);
}
else if ( rent < 0 )
{
printf("\nError! Entry not valid, try again.\n");
}
}
while (rent != 0);
return 0;
} |
[Makefile] Pas de règle pour la cible main.c
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