/*文件名:exam12_1.cpp*/
#include <stdio.h>
#include <stdlib.h>		/*含有exit()的函數(shù)原型*/
main()
{
	FILE *fp;
	if ((fp=fopen("abc.txt","w"))==NULL) /*檢查能否打開(kāi)abc.txt文件*/
	{
		printf("不能建立abc.txt文件\n");
		exit(0); 
	}
}