IO进程作业

时间

#include <myhead.h>

int main(int argc, const char *argv[])
{
	//定义一个系统时间变量
	//time_t sysTime = time(NULL);

	//定义时间结构体指针，执行时间
	//struct tm *tm_ptr = localtime(&sysTime);

	FILE *fp;
	if((fp=fopen("./03day3.txt","w+"))==NULL)
	{
		perror("fopen perror");
		return -1;
	}

	while(1)
	{
		int c=0;  //显示序号
		char buf;
		fseek(fp,0,SEEK_SET);
		while((buf=fgetc(fp))!=EOF)
		{
			if(buf=='\n')
			{
				c++;
			}
		}
		printf("%d\n",c);
		time_t sysTime = time(NULL);
		struct tm *tm_ptr = localtime(&sysTime);
		fseek(fp,0,SEEK_END);
		fprintf(fp,"%d、%4d-%2d-%2d %02d:%02d:%02d\n",\
				c,tm_ptr->tm_year+1900,\
		  		tm_ptr->tm_mon+1,\
		        tm_ptr->tm_mday,\
		        tm_ptr->tm_hour,\
		        tm_ptr->tm_min,\
		        tm_ptr->tm_sec);
		usleep(1000000);
		sysTime+=1;
	}

	//关闭文件指针
	fclose(fp);

	return 0;
}

使用fread、fwrite完成两个文件的拷贝

#include <myhead.h>
int main(int argc, const char *argv[])
{
	//定义一个只写文件指针
	FILE *fp;
	/*if((fp=fopen("./01day3.txt","w"))==NULL)
	{
		perror("fopen error");
		return -1;
	}

	int a=1;  //控制循环次数
	while(a<4)
	{
		fprintf(fp,"%s","hello world\n");
		a++;
	}*/	

	//将上一个文件改为只读
	if((fp=fopen("./01day3.txt","r"))==NULL)
	{
		perror("fopen error");
		return -1;
	}

	//定义一个只写文件指针
	FILE *fq;
	if((fq=fopen("./02day3.txt","w"))==NULL)
	{
		perror("fopen error");
		return -1;
	}

	//将光标定位到结尾
	fseek(fp,0,SEEK_END);
	int t=ftell(fp);  //求文件大小
	fseek(fp,0,SEEK_SET);  //将光标重新定位到开头

	char arr[t-1];
	while((fread(arr,sizeof(arr),1,fp))!=0)
	{
		fwrite(arr,sizeof(arr),1,fq);
	}

	//关闭文件1和文件2
	fclose(fp);
	fclose(fq);

 	return 0;
}

思维导图