/*function pointer example in c.*/#include <stdio.h>//function: sum, will return sum of two//integer numbersintaddTwoNumbers(intx,inty) {returnx+y; }intmain() {inta, b, sum;//function pointer declarationint(*ptr_sum)(int,int);//function initialisationptr_sum=&addTwoNumbers; a=10...
An Example of Null pointer in C Any pointer that contains a valid memory address can be made as aNULL pointerby assigning0. Example Here, firstlyptris initialized by the address ofnum, so it is not a NULL pointer, after that, we are assigning0to theptr, and then it will become a NU...
Pointers in C has always been a complex concept to understand for newbies. In this article, we will explain the difference between constant pointer, pointer to constant and constant pointer to constant. This article is part of the ongoing series on C pointers:part 1,part 2, part 3 (this a...
C++ Pointer Arithmetic - Learn how to use pointer arithmetic in C++, including the basics of pointers, memory addresses, and how to manipulate data in arrays.
#define safeFree(p) saferFree((void**)&(p)); //void freePointer(int** pointer); void saferFree(void** ptr); int main() { int* pointer = (int*)malloc(sizeof(int)); *pointer = 10; printf("pointer 的數值 = %p\n", pointer); printf("對 pointer 取值 = %d\n", *pointer); ...
Lets understand this with the help of an example: Here we have a functionsumthat calculates the sum of two numbers and returns the sum. We have created a pointer f2p that points to this function, we are invoking the function using this function pointer f2p. ...
C Constant pointer A pointer is said to be constant pointer when the address its pointing to cannot be changed. Lets take an example : char ch, c; char *ptr = &ch ptr = &c In the above example we defined two characters (‘ch’ and ‘c’) and a character pointer ‘ptr’. First...
Example #include<stdio.h> main (){ int a = 10; int *p; int **q; p = &a; q = &p; printf("a =%d",a); printf("a value through pointer = %d", *p); printf("a value through pointer to pointer = %d", **q); } Output a=10 a value through pointer = 10 a value thro...
Example of this Pointer in Java Next → ← Prev Like/Subscribe us for latest updates About Dinesh Thakur Dinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer sof...
Example of double Pointer Lets write a C program based on the diagram that we have seen above. #include<stdio.h>intmain(){intnum=123;//A normal pointer pr2int*pr2;//This pointer pr2 is a double pointerint**pr1;/* Assigning the address of variable num to the ...