A function in C that returns a function that adds x to its argument

In a thread on JoS, Quickie asked,

"Write a function in C that returns a function that adds x to its argument."

http://discuss.fogcreek.com/joelonso...&ixPost=146457

Here's my go at it. It compiles, links, but prints junk. So it basically doesn't do what it was supposed to do. Comments welcome.

Code:

---

/*Write a function in C that returns a
function that adds x to its argument

  x in this case is 2
*/

#include <stdio.h>

int Add2(int);
typedef int(*fnptr)(int);
int (*fn(void))(int);


int main(void)
{
    int (*fnptr)(int);
    fnptr=fn;
    printf("%d", (*fnptr)(3));
}

   
int Add2(int a)
{
    return a+2;
}

fnptr fn(void)
{
    return &Add2;
}

---

see the line:

Code:

---

fnptr=fn;

---

try

Code:

---

fnptr=fn();

---

Also:

Code:

---

fnptr fn(void)
{
    return &Add2;
}

---

Add2 is the address of the function - you dont need to take the address of it again.

Code:

---

fnptr fn(void)
{
    return Add2;
}

---

Old habits die hard. Realized was calling the function fn without the paranthesis. Thanks for the awakening!