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adding in comments so that line numbers match up (which I should have been doing all along)

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This commit is contained in:
Dan Buch 2011-09-18 13:34:09 -04:00
parent 9158c349b3
commit 8c6e140dad
1 changed files with 7 additions and 1 deletions
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8
ex15.c
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@ -2,15 +2,17 @@
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
// create two arrays we care about
int ages[] = {23, 43, 12, 89, 2}; int ages[] = {23, 43, 12, 89, 2};
char *names[] = { char *names[] = {
"Alan", "Frank", "Alan", "Frank",
"Mary", "John", "Lisa" "Mary", "John", "Lisa"
}; };
// safely get the size of ages
int count = sizeof(ages) / sizeof(int); int count = sizeof(ages) / sizeof(int);
int i = 0; int i = 0;
// first way using indexing
for(i = 0; i < count; i++) { for(i = 0; i < count; i++) {
printf("%s has %d years alive.\n", printf("%s has %d years alive.\n",
names[i], ages[i]); names[i], ages[i]);
@ -18,9 +20,11 @@ int main(int argc, char *argv[])
printf("---\n"); printf("---\n");
// setup the pointers to the start of the arrays
int *cur_age = ages; int *cur_age = ages;
char **cur_name = names; char **cur_name = names;
// second way using pointers
for(i = 0; i < count; i++) { for(i = 0; i < count; i++) {
printf("%s is %d years old.\n", printf("%s is %d years old.\n",
*(cur_name+i), *(cur_age+i)); *(cur_name+i), *(cur_age+i));
@ -28,6 +32,7 @@ int main(int argc, char *argv[])
printf("---\n"); printf("---\n");
// third way, pointers are just arrays
for(i = 0; i < count; i++) { for(i = 0; i < count; i++) {
printf("%s is %d years old again.\n", printf("%s is %d years old again.\n",
cur_name[i], cur_age[i]); cur_name[i], cur_age[i]);
@ -35,6 +40,7 @@ int main(int argc, char *argv[])
printf("---\n"); printf("---\n");
// fourth way with pointers in a stupid complex way
for(cur_name = names, cur_age = ages; for(cur_name = names, cur_age = ages;
(cur_age - ages) < count; (cur_age - ages) < count;
cur_name++, cur_age++) cur_name++, cur_age++)