动态增长数组

#include <stdio.h>
#include<stdlib.h>
#include<setjmp.h>
jmp_buf buf;
int current_element = 0;
int total_element = 128;
char* dynamic = (char*)malloc(total_element);//动态分配数组
void add_element(char c);
int main() {
	if (dynamic == NULL)//判断是否分配空间
		printf("Please malloc again");
	if (setjmp(buf))//进行标记
	{
		printf("error");
		return 0;
	}
	else printf("peace through");
	/*数据填充*/
	for ( current_element = 0; current_element < 256; current_element++){
		/*判断内存是否足够*/
		if (current_element < total_element-1){
			dynamic[current_element] = current_element;
			printf("%d\n", current_element);
		}
		else 
		add_element(current_element-1);
	}
	dynamic[current_element] = '\0';
	free(dynamic);
}
/*数组增长*/
void add_element(char c) {
	if (current_element == total_element - 1) {//边界判断
		total_element *= 2;
		dynamic = (char*)realloc(dynamic, total_element);//将表的长度扩展一倍
		if (dynamic == NULL) {//realloc函数失败会将指针变成NULL
			printf("Coundn't expend the table");
			longjmp(buf, 1);//跳回标记
		}
	}
	current_element++;
	dynamic[current_element] = c;
}

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