inner function closure in C

gistfile1.c

#include <stdlib.h>
#include <stdio.h>

int(*outer(int val))() {
  int inner() {
    return val;
  }
  return inner;
}

int main() {
  printf("%d\n", outer(5)());
  return 0;
}

$ gcc -fnested-functions -o closure closure.c
$ ./closure
5