IO进程线程

练习

1.使用标准IO函数，实现文件的拷贝

#include <head.h>
int main(int argc, const char *argv[])
{
	FILE* fp=fopen("./one.text","r+");
	if(fp==NULL)
	{
		PRINT_ERROR("fopen error");
	}
	
	FILE* fp1=fopen("./two.text","r+");
	if(fp1==NULL)
	{
		PRINT_ERROR("fopen error");
	}
 
	while(1)
	{
		int res_get=fgetc(fp);
		if(res_get==EOF)
			break;
		fseek(fp1,0,SEEK_END);
		int res_put=fputc(res_get,fp1);
	}
 
	fseek(fp1,0,SEEK_SET);
	while(1)
	{
		int res=fgetc(fp1);
		if(res==EOF)
			break;
		printf("%c",res);
	}
	
 
 
	fclose(fp);	
	return 0;
}

2.使用fgets函数，打印一个文件，类似cat

#include <head.h>
int main(int argc, const char *argv[])
{
	FILE* fp=fopen("./one.text","r");
	if(fp==NULL)
		PRINT_ERROR("fopen error");
 
	while(1)
	{
		char buf[128]={0};
		if(fgets(buf,128,fp)==NULL)
			break;
		printf("%s",buf);
	}
 
	fclose(fp);
	return 0;
}

3.计算文件的行数

#include <head.h>
int main(int argc, const char *argv[])
{
	FILE* fp=fopen("./one.text","r");
	if(fp==NULL)
		PRINT_ERROR("fopen error");
 
	int line=0;
	while(1)
	{
		char buf[128]={0};
		if(fgets(buf,128,fp)==NULL)
			break;
		line++;
	}
	printf("%d\n",line);
 
	fclose(fp);
	return 0;
}