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using separate func for printing different formats, but still need to write different funcs for different ways of looping?

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This commit is contained in:
Dan Buch 2011-09-19 22:58:45 -04:00
parent 9dfa986b5d
commit 728a7c5bd8
1 changed files with 16 additions and 39 deletions
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55
ex15.c
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@ -1,5 +1,16 @@
#include <stdio.h>
void print_names_ages(int count, char *names[], int ages[], const char *fmt)
{
int i;
for(i = 0; i < count; i++) {
printf(fmt, names[i], ages[i]);
}
printf("---\n");
}
int main(int argc, char *argv[])
{
// create two arrays we care about
@ -10,47 +21,13 @@ int main(int argc, char *argv[])
};
// safely get the size of ages
int count = sizeof(ages) / sizeof(int);
int i = 0;
// first way using indexing
for(i = 0; i < count; i++) {
printf("%s has %d years alive.\n",
names[i], ages[i]);
}
printf("---\n");
// setup the pointers to the start of the arrays
int *cur_age = ages;
char **cur_name = names;
// second way using pointers
for(i = 0; i < count; i++) {
printf("%s is %d years old.\n",
*(cur_name+i), *(cur_age+i));
}
printf("---\n");
// third way, pointers are just arrays
for(i = 0; i < count; i++) {
printf("%s is %d years old again.\n",
cur_name[i], cur_age[i]);
}
printf("---\n");
// fourth way with pointers in a stupid complex way
for(cur_name = names, cur_age = ages;
(cur_age - ages) < count;
cur_name++, cur_age++)
{
printf("%s lived %d years so far.\n",
*cur_name, *cur_age);
}
printf("---\n");
print_names_ages(count, names, ages, "%s has %d years alive.\n");
print_names_ages(count, names, ages, "%s is %d years old.\n");
print_names_ages(count, names, ages, "%s is %d years old again.\n");
print_names_ages(count, names, ages, "%s lived %d years so far.\n");
int i;
char **arg = argv;
for(i = 0; i < argc; i++) {
printf("argument %d is '%s' (address = %p)\n", i, *arg, arg);