main.c

飞机票的预定系统

void main()
{
	FILE *f;
	if ((f=fopen("a.dat","r"))==NULL)
	{
		printf("File Can't be find!\n");
	}
	else
	{
		fread(&a,sizeof(a),1,f);
	}
	fclose(f);
	if ((f=fopen("a.dat","r+"))==NULL)
	{
		printf("File Can't be find!\n");
	}
	else
	{
		a++;
		fwrite(&a,sizeof(a),1,f);
	}
	fclose(f);
}