C语言“引用” 简化代码

#include<stdio.h>

int main () {
	
	char arr[10] = {"123"};
	
	char k = 0;
	
	char & a = arr[k];
	
	k = 2;
	
	a = '5';
	
	printf("%c", a);
	
	return 0;
}