1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#define print_int_expr_and_value(n) printf("%s == %d\n", (#n), (n))
// CORRECT swap(…)
void swap(int* a_lhs, int* a_rhs) {
int lhs = *a_lhs; // *a_lhs means "value at (address) a_lhs"
int rhs = *a_rhs; // *a_rhs means "value at (address) a_rhs"
*a_lhs = rhs; // "Store (value) rhs at (address) a_lhs."
*a_rhs = lhs; // "Store (value) lhs at (address) a_rhs."
// >>> Memory form is a snapshot of memory as of right here. <<<
}
int main(int argc, char* argv[]) {
int n1 = 3;
int n2 = 100;
print_int_expr_and_value(n1);
print_int_expr_and_value(n2);
swap(&n1, &n2);
printf("\nCalled swap(…)\n");
print_int_expr_and_value(n1);
print_int_expr_and_value(n2);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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