12.4. Declaring and Defining Nested Functions
If you are defining a function at the
Example 12-2. simple nested function
#include <stdio.h>
int
main()
{
int swap (int *a, int *b)
{
int c;
c = *a;
*a = *b;
*b = c;
return 0;
}
int first = 12, second = 34;
printf("f is %d and s is %d\n", first, second);
swap(&first, &second);
printf("f is %d and s is %d\n", first, second);
return 0;
}
You don't have to declare nested functions like you do normal
functions however you can if you like. The only reason for doing
so would be for the sake of readability, you might like the function
definition to appear near where it is used. It's up to you, but if
you do decide to declare you nested function you must explicitly
declare it as
auto.
