C++ using pointers pro

A simple program using pointers

#include 

#include

using namespace std;

int main()

{

   int intnum; 

   float floatnum;

   int *pintnum;

   float *pfloatnum;

   intnum = 10;

   floatnum = 12.34;

   pintnum = &intnum;

   pfloatnum = &floatnum;

             cout << "Before increment: " << endl;

   cout << "\t IntNum is: " << intnum << endl;

   cout << "\t FloatNum is: " << floatnum << endl;

   cout << "\t pIntNum contains: " << *pintnum << endl;

   cout << "\t pFloatNum contains: " << *pfloatnum << endl;

   (*pintnum)++;  

   (*pfloatnum)++;

   cout << "After increment: " << endl;

   cout << "\t IntNum is: " << intnum << endl;

   cout << "\t FloatNum is: " << floatnum << endl;

   cout << "\t pIntNum contains: " << *pintnum << endl;

   cout << "\t pFloatNum contains: " << *pfloatnum << endl;

   return 0;

}

Pointer to characters

#include 

#include  

using namespace std;

int main()

{

   char *buffer = "dummy content.";

   cout << "Original content of buffer:--> " << buffer << endl;

   cout << "Enter a sentense: " << endl;

   gets(buffer);

   cout << "Now the Buffer contains:--> " << endl;

   cout << buffer << endl;

   return 0;

}

Pointer Arithmetic

#include 

#include

using namespace std;

int main()

{

   int intarray

[10]; 

   int        *pInt;        

   int        i;            

   for(i = 0; i < 10; i++)

   {

               intarray[i] = i+1;

   }

   pint = intarray;

   for (i = 0; i < 10; i++)

   {

               cout << *pint << ' ' ;

               pInt++;            

               cout << *(pint++) << ' ' ;

   }

   cout << endl;

   return 0;

}

Array of Pointers

#include 

#include 

using namespace std;

int main()

{

            const char* const Fortune[5] = 

            {" Earth is a great funhouse without the fun.",

                 " There is always more hell that needs raising.",

                 " Confession is good for the soul, but bad for the career.",

                 " Live in a world of your own, but always welcome visitors.",

                 " The man who laughs has not yet been told the terrible news."

                 };

   cout << "Here are the 5 fortunes: " << endl;

   for(int i = 0; i < 5; i++)

   {

               cout << Fortune[i] << endl;

      }

   }                    

A program demonstrating modularity in C++

#include 

#include 

#include

using namespace std;

int main()

{

   int number;

   int abs_number;

   cout << "This program finds the absolute value of an integer." << endl;

   cout << "Enter an integer (positive or negative): ";

   cin >> number;

   abs_number = Abs(number);

   cout << "The absolute value of " << number << " is " << abs_number;

   cout << endl;

   return 0;

}

Variables and Constants

#include 

#include

using namespace std;

const int Const_val = 5;        

int main()

{

   int    iValue;  

   float  fValue;  

   char   cValue;  

   iValue = 1234;    

   fValue = 1234.56; 

   cValue = 'A';     

   cout << "Integer value is: " << iValue << endl;

   cout << "Float value is: " << fValue <<  endl;

   cout << "Character value is: " << cValue << endl;

   cout << "The constant is: " << Const_val << endl;

   return 0;

}

Basic IO

#include 

#include

using namespace std;

int main()

{

  float gallons, liters;

  cout << "Enter number of gallons: ";

  cin >> gallons; 

  liters = gallons * 3.7854; 

  cout << "Liters: " << liters << endl; 

  return 0;

}