Use pointer as function parameter : Function Parameter « Function « C Tutorial

Home
C Tutorial
1.Language
2.Data Type
3.String
4.printf scanf
5.Operator
6.Statement
7.Array
8.Function
9.Structure
10.Pointer
11.Memory
12.Preprocessor
13.File
14.Data Structure
15.Search Sort
16.Wide Character String
17.assert.h
18.ctype.h
19.math.h
20.setjmp.h
21.signal.h
22.stdio.h
23.stdlib.h
24.string.h
25.time.h
26.wctype.h
C Tutorial » Function » Function Parameter 
8.5.4.Use pointer as function parameter
#include <stdio.h>

int change(int* pnumber);              /* Function prototype              */

int main(void)
{
  int number = 10;
  int *pnumber = &number;
  int result = 0;        

  result = change(pnumber);
  printf("\nIn main, result = %d\tnumber = %d", result, number);
  return 0;
}

int change(int *pnumber)
{
  *pnumber *= 2;
  printf("\nIn function change, *pnumber = %d\n", *pnumber );

  return *pnumber;
}
In function change, *pnumber = 20
     
     In main, result = 20    number = 20
8.5.Function Parameter
8.5.1.Parameter passing
8.5.2.Call by reference
8.5.3.Pass variables to function
8.5.4.Use pointer as function parameter
8.5.5.Cube a variable using call-by-value
8.5.6.Cube a variable using call-by-reference with a pointer argument
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.