CHAPTER 2—C++ PROGRAMMING BASICS codes;

/**1.  Assuming there are 7.481 gallons in a cubic foot, write a program that asks the user to enter a
  number of gallons, and then displays the equivalent in cubic feet.*/
#include<iostream.h>
#include<conio.h>

#define g_per_f 7.481

void main(void)
{
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";

 float n_gallons;

 do{
 cout<<"Enter the number of gallons  : \xdb\t";
 cin >>n_gallons;
 cout<<"The equivalent in cubic feet : \xdb\t"<<n_gallons / g_per_f<<endl;
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}

Code:

/**2.  Write a program that generates the following table: 
    1990      135
    1991     7290
    1992    11300
    1993    16200


Use a single cout statement for all output.*/
#include<iostream.h>
#include<iomanip.h>
#include<conio.h>

void main(void)
{
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";

 int i, i_arr[4]={135,7290,11300,16200};

 do{
 for(i=1990;i<1994;i++) cout<<i<<setw(7)<<i_arr[i-1990]<<endl;
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}

Code:

/**3.  Write a program that generates the following output: 
    10
    20
    19


  Use an integer constant for the 10, an arithmetic assignment operator to generate the 20, and a
  decrement operator to generate the 19. */
#include<iostream.h>
#include<conio.h>

#define ten 10

void main(void)
{
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";

 //int ten = 10; //### use this line in the place of "define"
 //int second, third;
 //second = 2*ten; third = second-1;
 //cout<<ten<<endl<<second<<endl<<third<<endl;
 do{
 cout<<ten<<endl<<2*ten<<endl<<2*ten-1<<endl;
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}

Code:

/*4.  Write a program that displays your favorite poem. Use an appropriate escape sequence for the
  line breaks. If you don’t have a favorite poem, you can borrow this one by Ogden Nash: 

    Candy is dandy,
    But liquor is quicker.
*/
#include<iostream.h>
#include<conio.h>

void main(void)
{
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";

 do{
 cout<<"\tLa Ilah Ila Allah\n\tMohamed Rasoul Allah"<<endl;
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}

Code:

/*5.  A library function, islower(), takes a single character (a letter) as an argument and returns a
  nonzero integer if the letter is lowercase, or zero if it is uppercase. This function requires the header
  file CTYPE.H. Write a program that allows the user to enter a letter, and then displays either zero or
  nonzero, depending on whether a lowercase or uppercase letter was entered. (See the SQRT
  program for clues.)*/
#include<iostream.h>
#include<conio.h>
#include<ctype.h>

void main(void)
{
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";

 do{
 cout<<"Enter a letter : \xdb\t"<<endl;
 cout<<islower(getch())<<"\nthis value must be zero if you entred an uppercase letter and nonzero case else."<<endl;
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}

Code:

/*6.  On a certain day the British pound was equivalent to $1.487 U.S., the French franc was $0.172,
  the German deutschemark was $0.584, and the Japanese yen was $0.00955. Write a program that 
  allows the user to enter an amount in dollars, and then displays this value converted to these four
  other monetary units.*/
#include<iostream.h>
#include<conio.h>

#define pound         1.487
#define franc         0.172
#define deutschemark  0.584
#define yen           0.00955

void main(void)
{ 
 cout<<"### Programmed By Amahdy(MrJava) ,right restricted.~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
 cout<<"-------------------------------------------------------------------------------\n\n";
 int dollars;

 do{
 cout<<"Enter the U.S. amout : \xdb\t";
 cin >>dollars;
 cout<<endl;
 cout<<"British  pound         =\t" << dollars / pound        <<endl;
 cout<<"French   franc         =\t" << dollars / franc        <<endl;
 cout<<"German   deutschemark  =\t" << dollars / deutschemark <<endl;
 cout<<"Japanese yen           =\t" << dollars / yen          <<endl;
 //cout<<"\nAnother operation ? (y/n) : ";  //use this line to continue using the programme.
 cout<<"\n !Press c to continue or any key to exit."<<endl<<endl;
 }while(getch()=='c');
}