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 30 31 32 33 34 35 36 37 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#define log_str(n) printf("%s == \"%s\"\n", #n, (n))
#define log_addr(n) printf("%s == %p\n", #n, (void*)(n))
int main(int argc, char* argv[]) {
char stack_str[] = "ABC";
log_str(stack_str);
log_addr(stack_str);
char* data_str = "Hello World";
log_str(data_str);
log_addr(data_str);
// step 1: figure out the size of the string
int str_len = 0;
for (; data_str[str_len] != '\0'; str_len++) {}
// str_len is the logical length of my string
// step 2: allocate the string
char* heap_str = malloc(sizeof(*heap_str) * (str_len + 1));
// step 3: fill in the string
for (int i = 0; data_str[i] != '\0'; i++) {
heap_str[i] = data_str[i];
}
// don't forget the null character
heap_str[str_len] = '\0';
log_str(heap_str);
log_addr(heap_str);
free(heap_str);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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