一个“无聊”的关于指针的演示程序

#include <stdio.h>

int main(int argc, char *argv[])
{ 
	// create two arrays we care about
	int ages[] = {23, 43, 12, 89, 2}; 
	char *names[] = {"Alan", "Frank","Mary", "John", "Lisa"}; 
	// 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);
	}
	
	return 0;
}