Chapter 9, Problem 1P

Program Plan Intro

Program Plan:

• Include required header files.
• Declaration of function prototype.
• Definition for function “main()”.
  • Declare and initialize the variable “var”.
  • Print the value before calling function
  • Call the function “addOne()”.
  • Print the value after calling function.
  • Return the value “0”.
• Definition of function “addOne()”.
  • Increment the pointer variable.

Program Description Answer

The given program is to add one to the integer referenced by “ptrNum” by using reference parameter syntax.

Explanation of Solution

//Include required header files

#include<iostream>

using namespace std;

//Declaration of function header

void addOne(int *ptrNum);

//Definition of function main()

int main()

{

    //Declare and initialize the variable "var".

    int var = 10;

    //Print the value before calling function

  cout << "Value before calling function = " << var << '\n';

    //Call the function

    addOne(&var);

    //Print the value after calling function

  cout << "Value after calling function = " << var << '\n';

    //Return the value "0"

    return 0;

}

//Definition of function "addOne()"

void addOne(int *ptrNum)

{

    //Increment the pointer variable

    *ptrNum = *ptrNum + 1;

}

Sample Output

Output:

Value before calling function = 5

Value after calling function = 6