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@ -1,15 +1,7 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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void print_with_array_indexing(int count, char *names[], int ages[])
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{
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// create two arrays we care about
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int ages[] = {23, 43, 12, 89, 2};
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char *names[] = {
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"Alan", "Frank",
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"Mary", "John", "Lisa"
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};
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// safely get the size of ages
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int count = sizeof(ages) / sizeof(int);
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int i = 0;
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// first way using indexing
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@ -19,7 +11,11 @@ int main(int argc, char *argv[])
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}
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printf("---\n");
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}
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void print_with_pointer_arithmetic(int count, char *names[], int ages[])
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{
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int i;
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// setup the pointers to the start of the arrays
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int *cur_age = ages;
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char **cur_name = names;
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@ -31,7 +27,13 @@ int main(int argc, char *argv[])
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}
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printf("---\n");
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}
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void print_with_pointers_as_arrays(int count, char *names[], int ages[])
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{
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int i;
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int *cur_age = ages;
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char **cur_name = names;
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// third way, pointers are just arrays
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for(i = 0; i < count; i++) {
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printf("%s is %d years old again.\n",
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@ -40,6 +42,13 @@ int main(int argc, char *argv[])
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printf("---\n");
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}
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void print_in_stupidly_complex_way(int count, char *names[], int ages[])
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{
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int *cur_age = ages;
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char **cur_name = names;
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// fourth way with pointers in a stupid complex way
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for(cur_name = names, cur_age = ages;
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(cur_age - ages) < count;
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@ -50,7 +59,26 @@ int main(int argc, char *argv[])
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}
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printf("---\n");
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}
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int main(int argc, char *argv[])
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{
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// create two arrays we care about
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int ages[] = {23, 43, 12, 89, 2};
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char *names[] = {
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"Alan", "Frank",
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"Mary", "John", "Lisa"
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};
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// safely get the size of ages
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int count = sizeof(ages) / sizeof(int);
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print_with_array_indexing(count, names, ages);
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print_with_pointer_arithmetic(count, names, ages);
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print_with_pointers_as_arrays(count, names, ages);
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print_in_stupidly_complex_way(count, names, ages);
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int i;
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char **arg = argv;
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for(i = 0; i < argc; i++) {
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printf("argument %d is '%s' (address = %p)\n", i, *arg, arg);
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