> Here is a simple program that calls a function with two
> parameters, one called by value, the other by reference.
> f(int a, int *b) {
> a += 1; // modifies a local variable
> *b += 10; // modifies the caller's variable }
> main() {
> int x = 0;
> f(x, &x); // pass the value and the pointer
> printf("x = %d\n", x);
> }
> // output is x = 10
Passing "x" twice in the same function call is distracting, IMHO. Try this
rewrite.
[ Also, more comments, please. I'm a tech writer by trade. :-) ] -John
----------------
f(int a, int *b) {
a += 1; /* modifies a local variable */
*b += 12; /* modifies the caller's variable */
}
main() {
int x = 5;
int y = 30;
/* pass value of x, reference to y */
f(x, &y);
/* show results */
printf("x = %d\n", x);
printf("y = %d\n", y);
}
program output:
x = 5
y = 42
----------------
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