Pointers to functions are interesting when you pass them to other functions. A function that takes function pointers says, in effect, ?Part of what I do can be customized. Give me a pointer to a function, and I?ll call it when that part of the job needs to be done. That function can do its part for me.? This is known as a ?callback.? It?s used a lot in graphical user interface libraries, in which the style of a display is built into the library but the contents of the display are part of the application.As a simpler example, say you have an array of character pointers (char*s), and you want to sort it by the value of the strings the character pointers point to. The standard qsort() function uses function pointers to perform that task. qsort() takes four arguments,?a pointer to the beginning of the array,?the number of elements in the array,?the size of each array element, and?a comparison function, and returns an int.
C
Topic: Pointers
When would you use a pointer to a function?
Browse random answers:
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Declare an array of three function pointers where each function receives two integers andreturns float.
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Discuss on pointer arithmetic?
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what are pointers integer?
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What is a huge pointer?
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What will be the output of the program ? #include<stdio.h>#include<string.h>int main(){ int i, n; char *x="Alice"; n = strlen(x); *x = x[n]; for(i=0; i<=n; i++) { printf("%s ", x); x++; } printf("\n", x); return 0;}
Point out the compile time error in the program given below.#include<stdio.h>int main(){ int *x; *x=100; return 0;}
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When would you use a pointer to a function?
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How I can add two numbers in c language without using Arithmetic operators?
WRITE A C PROGRAMME TO FIND OUT THE AREA OF A CIRCLE USING POINTER.
How reliable are floating-point comparisons?
What is a void pointer?
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How to operate pointers in any pragram & how to develop our logic while implementing pointer
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Linked Lists -- Can you tell me how to check whether a linked list is circular?
The sizeof( ) function doesn’t return the size of the block of memory pointed to by a pointer. Why?
The sizeof( ) function doesn’t return the size of the block of memory pointed to by a pointer. Why?
What are FP_SEG And FP_OF ?
