oops week16

Week 16 solutions

16a) Write a C++ program that reads a text file and 
writes out how many characters of each character 
classification are in the file.

File: file.txt
  
 HELLO world

Program:

#include<iostream>
#include<fstream>
#include<ctype.h>
using namespace std;
int main()
{ 
 
        int v[26]={0},index=0; 
        ifstream file("file.txt");
        char c=file.get();
        while(!file.eof())
        {
             if(isalpha(c))
             {
                  c = tolower(c);
                  index = c - 'a';
                  v[index]++;
             }
           c=file.get();
       }
      file.close();
      cout<<"\nFrequency of each character \n";
      cout<<"Character Frequency\n\n";
      for(int i=0;i<26;i++)
      {
          if(v[i]>0)
          cout<<char(97+i)<<"\t  "<<v[i]<<"\n";
      }
      return 0;
}
output:


Frequency of each character
Character Frequency

d         1
e         1
h         1
l         3
o         2
r         1
w         1


  

16b) Write a C++ program draw a rectangle as a rectangle and as a 
polygon.Make the lines of the polygon red and the lines of the 
rectangle blue.


program:

#include<graphics.h>
#include<conio.h>
void poly();
int main()
{
      int gd = DETECT,gm;
      initgraph(&gd, &gm, "C:\\TC\\BGI");
      setbkcolor(WHITE);
      setcolor(BLUE);
      rectangle(100,30,200,80);
      poly();
      getch();
      closegraph();
      return 0;
}
void poly()
{
        setcolor(RED);
        line(250,100,120,150);
        line(250,100,120,300);
        line(120,150,120,300);
}

output:  

16c) Write a C++ program draw a 100-by-30 rectangle and place the 
text “PVPSIT” inside it.
program:

#include<graphics.h>
#include<conio.h>
 
int main()
{
        int gd = DETECT,gm;
        initgraph(&gd, &gm, "C:\\TC\\BGI");
        setbkcolor(WHITE);
        setcolor(GREEN);
        rectangle(100,30,200,80);
        setcolor(RED);
        outtextxy(120,40,"PVPSIT");
        getch();
        closegraph();
        return 0;
}

output: