C Function Pointers:
The Basics
COSC 341/342:
Programming Languages, WI 2010
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C Function Pointers: A Comprehensive Guide, Lecture notes of Programming Languages
A detailed explanation of C function pointers, including their declaration, usage, and an example of an array of function pointers. Students of computer science, particularly those studying programming languages, will find this document useful for understanding the concept of function pointers in C programming.
What you will learn
- How do you declare and use a function pointer in C?
- What is a function pointer in C?
- What is an array of function pointers and how is it used in C?
Typology: Lecture notes
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C Function Pointers:
The Basics
COSC 341/342:
Programming Languages, WI 2010
Bottom line
A function pointer is a pointer to compiled function code.
#include <stdio.h> int addi (int x, int y) { return x+y; } int subi (int x, int y) { return x-y; } int useFunctionPtr ( int a, int b, int (* fun ) (int, int)) { return fun(a, b); } int main () { int x = 3, y = 5, result; result = useFunctionPtr (x, y, &addi); printf("%d + %d = %d\n", x, y, result); result = useFunctionPtr (x, y, &subi); printf("%d - %d = %d\n", x, y, result);
Another example, declaring & using
#include <stdio.h> #include <stdlib.h> int addi (int x, int y) { return x+y; } int subi (int x, int y) { return x-y; } int main () { int x, y, result; char op; int (func) (int, int); printf("Enter int op int, no blanks (e.g., 3+144)"); scanf("%d%c%d", &x, &op, &y); printf("You entered %d %c %d\n", x, op, y); if (op == '+') func = &addi; else if (op == '-') func = &subi; else exit(1); result = (func)(x, y); printf("%d %c %d= %d\n", x, op, y, result);
Using an array of function pointers
#include <stdio.h> int addi(int x, int y) { return x+y; } int subi(int x, int y) { return x-y; } int main () { int i, x, y, result; char op; int (funcArr[2]) (int, int); // an array of function ptrs funcArr[0] = &addi; funcArr[1] = &subi; int dataArr[4][2] = { {1, 10}, {2, 20}, {3, 30}, {4, 40}}; for (i=0; i<4; i++) { x = dataArr[i][0]; y = dataArr[i][1]; op = (i%2)? '-' : '+'; result = (funcArr[i%2])(x, y); printf("%d %c %d = %d\n", x, op, y, result); }