Pointer to function: Function has address that we can assign to pointer variable by which we can invoke the function.
| Syntax: <return_type> (*<ptr_name>)(args_list); Example: int (*fptr)(int,int); Where: “fptr” is a pointer that points to a function which is taking 2 integers and return integer. |
| int add(int,int); int sub(int,int); int main() { int r1, r2, r3, r4; int (*fptr)(int,int); r1=add(10,20); r2=sub(10,20); printf(“r1 : %d\nr2 : %d\n”,r1,r2); fptr = &add; /*pointing to add function*/ r3=fptr(30,50); fptr = ⊂ /*pointing to sub function*/ r4=fptr(30,50); printf(“r3 : %d\nr4 : %d\n”,r3,r4); return 0; } int add(int x, int y) { return x+y; } int sub(int x, int y) { return x-y; } |