Use Of Pointers

Use Of Pointers

   #include <iostream>
   using namespace std;
   int main()
   {
     // declare an integer and a float variable
     int IntNum;
     float FloatNum;
     // declare integer and float pointers
     int *pIntNum;
     float *pFloatNum;
     // initialize the integer and float variables
     IntNum = 10;
     FloatNum = 12.34;
     // store addresses in pointers
     pIntNum = & IntNum;
     pFloatNum = & FloatNum;
     // print out the original values
     cout << "Before increment: " << endl;
     cout << "\t IntNum is: " << IntNum << endl;
     cout << "\t FloatNum is: " << FloatNum << endl;
     // note that we need to dereference a pointer in order
     // to extract the value it contains.
     cout << "\t pIntNum contains: " << *pIntNum << endl;
     cout << "\t pFloatNum contains: " << *pFloatNum << endl;
     // increment values of the integer and float variables
     (*pIntNum)++; // dereference and then increment
     (*pFloatNum)++;
     // print out the values after increment
     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;
   }