In the above example, we used a character pointer ‘ptr’ that points to character ‘ch’. In the last line, we change the value at address pointer by ‘ptr’. But if this would have been a pointer to a constant, then the last line would have been invalid because a pointer to a c...
Consider the example /*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=&...
cout<<"Switch replaced by function pointer: 2-5=";//display result cout<<result<<endl; } //Execute example code voidReplace_A_Switch() { cout<<endl<<"Executing function 'Replace_A_Switch'"<<endl; Switch(2,5,/*'+' specifies function 'Plus' to be executed*/'+'); Switch_With_Fun...
We can pass a null pointer to a function argument when we are not willing to pass any actual memory address. Example 1: int * aInt = NULL; Example 2: int fun(int *ptr) { return 15; } fun(NULL); Example 3: if (aINT != NULL) { //some code} else {//some code} Related Arti...
Here, we will learn how to pass a string (character pointer) in a function, where function argument is void pointer.Consider the given example#include <stdio.h> //function prototype void printString(void *ptr); int main() { char *str="Hi, there!"; printString(str); return 0; } /...
Note:The function pointer name is preceded by the indirection operator ( * ). Braces have a lot of importance when you declare a pointer to function in C programming. If in the above example, I remove the braces, then the meaning of the above expression will be changed. It becomes the ...
constptr.c: In function ‘main’: constptr.c:7: error: assignment of read-only location ‘*ptr’ So we see that the compiler complains about ‘*ptr’ being read-only. This means that we cannot change the value using pointer ‘ptr’ since it is defined a pointer to a constant. ...
1. Transfer into function the pointer of An data array: Take the example of my project: "Audio_Goertzel_Algorithm" 【声数函,方括号;调函数,没括号】 //---Some delaration in main() function: --- float data_Re[1024]; // Array of Real part of data float data_Im[1024...
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 ...
As aparameter to a function: int my_function(returnType(*parameterName)(parameterTypes)); (example code) As areturn value from a function: returnType(*my_function(int, ...))(parameterTypes); (example code) As acast(but try not to cast functions): ...