Create function with pointer parameter to double the parameter value - C++ Function

Description

Create function with pointer parameter to double the parameter value

Demo Code

#include <iostream>
using namespace std;
void double_it(int *p);
int main()//from ww  w.j  a v  a 2 s . c o  m
{
   int a = 5, b = 6;
   cout << "Val. of a before doubling: " << a << endl;
   cout << "Val. of b before doubling: " << b << endl;
   double_it(&a);             // Pass address of a.
   double_it(&b);             // Pass address of b.
   cout << "Val. of a after doubling: " << a << endl;
   cout << "Val. of b after doubling: " << b << endl;
   return 0;
}
void double_it(int *p) {
   *p = *p * 2;
}

Result

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Related Tutorials

• Passing by Reference
• Passing by Pointer
• Passing Values to Functions Through Parameters
• Use function parameters
• Main() function passes variables to receiving function, which calculates and prints values related to those passed variables.