Для кнопки Удалить:

void __fastcall TForm1::Button2Click(TObject *Sender)

{

if (!(ListBox1->ItemIndex == -1))

ListBox1->Items->Delete(ListBox1->ItemIndex);

}

Для кнопки Выход:

Close();

Сохраним и скомпилируем приложение, а затем протестируем его.

Итак, мы познакомились со средой разработки Borland C++ Builder и создали простое приложение. В следующих статьях этого цикла будут описаны приемы манипуляции компонентами на форме и более подробно рассмотрены особенности поведения различных компонентов в приложении

Практична частина

#include<iostream.h>

#include<graphics.h>

#include<conio.h>

#include<stdio.h>

#include<ctype.h>

#include<string.h>

#include<math.h>

#include<process.h>

#include<complex.h>

#include<conio.h>

#include<stdlib.h>

#include<iomanip.h>

#define MAX 50

#define ARRAYMAX 10

void initialize();

void menu1();

void menu2();

void data();

void graphch();

void corre();

void mean();

void median();

void graph();

void makegraph(float p[]);

void pie();

void mode();

void variance();

int input();

void correlation();

void regress();

void curvefit();

int midx = getmaxx()/2;

int midy = getmaxy()/2;

int choice1,choice2,choice3,choice4,choice5,choice6,choice7,choice8;

int a[100],b[100],c[100],d[100],e[100],f[100],g[100];

float men,medin,mod,cxy,vx,vy;

int a1,b1,c1,d1,e1,f1,g1,h1,i1,j1,k1,l1,m1,n1,o1,p1,q1;

long double z1=0,z2=0,z3=0,z4=0,z5=0,z6=0,z7=0,z8=0,byx=0,bxy=0,mx=0,my=0;

static int zzz;

s =0;

float s2 =0.0;

s3 =0;

s1 =0;

float sum =0.0;

float mean,variance,v1,v2,v3;

data();

clrscr();

switch(choice5)

{

case 1:

{

cout<<" Enter the total no of individual observations";

cin>>n;

for(int i=0;i<n;i++)

{

cout<<" X"<<i+1<< " =";

cin>>a[i];

s = s+ a[i];

}

mean = s/n;

for(i=0;i<n;i++)

{

sum = sum+ pow((a[i]-mean),2);

}

clrscr();

cout<<"The values of individual observations are ";

for(i=0;i<n;i++)

cout<<a[i]<<" ";

cout<<endl;

variance = sum/n;

break;

}

case 2:

{

cout<<"Enter the no of data";

cin>>nn;

cout<< "Enter the class interval size";

cin>>ci;

cout<<"Enter the upper most level";

cin>>up;

cout<<" Enter the lowermost level";

cin>>lo;

cout<<"Enter the frequency in order\n";

for(int i=0;i<nn;i++)

{ b[i] = ((up + ci) + up)/2;

up = up + ci;

cout<<" Freq"<<i+1<<" =";

cin>>c[i];

}

for(i=0;i<nn;i++)

{

d[i] = b[i] - b[nn/2];

e[i] = d[i]/ci;

}

for(i=0;i<nn;i++)

cout<<e[i]<<" ";

cout<<endl;

float sum2,sum3,sum4;

sum2 = 0.0;

sum3 =0.0;

sum4 = 0.0;

for(i=0;i<nn;i++)

{

sum2 = sum2 +(c[i]*e[i]);

sum3 = sum3 +(c[i]*pow(e[i],2));

sum4 = sum4+ c[i];

}

cout<<"The sum of f * u = "<<sum2<<endl;

cout<<" The sum of f*u2 = "<<sum3<<endl;

cout<<" The sum of f = "<<sum4<<endl;

v1 = sum3/sum4;

cout<<" The value of 1 = "<<v1<<endl;

v2 = sum2/sum4;

cout<<" The value of 2 = "<<v2<<endl;

v3 = pow(v2,2);

variance = (pow(ci,2)*(v1 -v3));

int u= up;

cout<<"Class\t"<<setw(12)<<"Mid "<<setw(10)<<"Frequency\n";

cout<<"interval\t"<<setw(12)<<"value"<<endl;

for( int k=0;k<nn;k++)

{

cout<<u<<" - "<<u+ci<<"\t"<<setw(12)<<b[k]<<setw(10)<<c[k]<<endl;

u = u+ci;

}

break;

}

case 3:

{ cout<<"Enter the total no of data";

cin>>nn;

char s[20],s4[20];

cout<<" X denotes ";

cin>>s;

cout<<" Frequency denotes ";

cin>>s4;

for(int i=0;i<nn;i++)

{

cout<<"X"<<i+1<<" =";

cin>>a[i];

cout<<"Freq"<<i+1<<" =";

cin>>b[i];

s3 = s3+b[i];

}

cout<<"The sum of f = "<<s3<<endl;

for(i=0;i<nn;i++)

{

s1 =s1+ (a[i]*b[i]);

}

cout<<"The sum of f*x = "<<s1<<endl;

mean = s1/s3;

for(i=0;i<nn;i++)

{

c[i] = pow((a[i]-mean),2);

s2 = s2 +(c[i]*b[i]);

}

cout<<"Mean = "<<mean<<endl;

cout<<"The sum of deviations = "<<s2<<endl;

variance = s2/s3;

cout<<setw(15)<<s<<setw(20)<<s4<<endl<<endl;

for(i=0;i<nn;i++)

{

cout<<setw(15)<<a[i]<<setw(20)<<b[i]<<endl;

}

break;

}

default:

{cout<<" Sorry wrong choice";

getch();

data();

}

}

cout<<" Variance ="<<variance;

getch();

int z=1;

while(z==1||z==2)

{

cout<<"\n\n\n\n\nPress 1 to return to previos menu";

cout<<"\nPress 2 to exit";

cin>>z;

if(z==1)

menu2();

else if(z==2)

exit(0);

else cout<<"Wrong choice";

}

}

char s[20],s1[20];

int input()

{

int n;

gotoxy(2,6);

cout<<"Enter the total no of data";

cin>>n;

cout<<"Enter the variable x and y values\n";

cout<<" X denotes ";

cin>>s;

cout<<" Y denotes ";

cin>>s1;

for(int i=0;i<n;i++)

{

cout<<" X"<<i+1<<" =";

cin>>f[i];

cout<<" Y"<<i+1<<" =";

cin>>g[i];

}

return(n);

}

void correlation()

{

int n;

corre();

initialize();

switch(choice4)

{

case 1:

{

n =input();

clrscr();

cleardevice();

initialize();

settextstyle(7,HORIZ_DIR,0);

outtextxy(50,30,"SCATTER DIAGRAM");

line(50,400,600,400);

line(50,400,50,50);

outtextxy(556,410,s);

settextstyle(7, VERT_DIR,0);

outtextxy(30,375,s1);

settextstyle(7, HORIZ_DIR,0);

for(int i=0;i<n;i++)

{ int x1 = f[i]+ 50;

int y1 = 400- g[i];

setfillstyle(SOLID_FILL,14);

setcolor(14);

circle(x1,y1,1);

floodfill(x1,y1,14);

}

break;

}

case 2:

{// clrscr();

// cleardevice();

float sum2,sum3,sum4,sum5,sum6;

n = input();

sum2 = 0.0;

sum3 =0.0;

sum4 =0.0;

sum5 =0.0;

sum6 =0.0;

clrscr();

cleardevice();

for(int i=0;i<n;i++)

{ sum2 = sum2 + f[i];

sum3 = sum3 + g[i];

}

cout<<setw(15)<<" X "<<setw(20)<<" Y "<<endl<<endl;

for(i=0;i<n;i++)

{

cout<<setw(15)<<f[i]<<setw(20)<<g[i]<<endl;

}

cout<<" The sum of X = "<<sum2<<endl;

cout<<"The sum of Y = "<<sum3<<endl;

float mex = sum2/n;

float mey = sum3/n;

cout<<" The mean of X = "<<mex<<endl;

cout<<"The mean of Y = "<<mey<<endl;

for(i=0;i<n;i++)

{

sum4 = sum4 +((f[i] -mex)*(g[i]-mey));

sum5 = sum5 + pow((f[i]-mex),2);

sum6 = sum6+ pow((g[i]-mey),2);

}

cout<<" The sum of products of deviation from mean of X and Y = "<<sum4<<endl;

cout<<"The sum of squares of deviation from mean of X = "<<sum5<<endl;

cout<<" The sum fo squares of deviation from mean of Y = "<<sum6<<endl;

float cov = sum4/n;

float varx = sqrt(sum5/n);

float vary = sqrt(sum6/n);

float coeff = ((cov/varx)/vary);

cout<<" THE COEFFICIENT OF CORRELATION = "<<coeff<<endl<<endl;

if(coeff<=1 && coeff>= -1)

{

if(coeff == -1)

cout<<" There is perfect negative correlation between X and Y\n";

else if(coeff ==1)

cout<<"There is perfect positive correlation between X and Y\n";

else if(coeff ==0)

cout<<" There is no correlation between X and Y\n";

else if (coeff<0)

cout<<" There is negative correlation between X and Y\n";

else if (coeff>0)

cout<<"There is positive correlation between X and Y\n";

}

else

cout<<"There seems to be a mistake in the data provided since the value of coefficient of correlation does not lie between -1 and 1";

break;

}

default:

{ outtextxy(30,midy +100," Sorry, you have entered the wrong choice");

getch();

cleardevice();

corre();

break;

}

}

getch();

cleardevice();

int z=1;

while(z==1||z==2)

{

cout<<"\n\n\n\n\nPress 1 to return to previos menu";

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