学习IO的第二天

 

作业1

#include 
#include 
#include 

int main(int argc, const char *argv[])
{
	FILE* sp=fopen("1.txt","r");
	if(NULL==sp)
	{
		perror("fopen");
		return -1;
	}

	char s[20]="";
	int count=0;
	while(1)
	{
		if(fgets(s,sizeof(s),sp)==NULL)
			break;

		count++;
	}
	printf("count=%d\n",count);
    fclose(sp);
	return 0;
}

作业2

#include 
#include 
#include 

int main(int argc, const char *argv[])
{

	FILE* sp=fopen("1.txt","w+");
	FILE* mp=fopen("2.txt","w+");
	if(NULL==sp||NULL==mp)
	{
		perror("open");
		return -1;
	}
	char s[20]="hello world 998";
	size_t res=0;
	res=fwrite(s,sizeof(s),1,sp);
	printf("res=%ld\n",res);
	char arr[20]="";
	fseek(sp,0,SEEK_SET);
	while(1)
	{
		memset(arr,0,sizeof(arr));
		res=fread(arr,sizeof(arr),1,sp);
		printf("%s",arr);
		if(0==res)
			break;
		fwrite(arr,sizeof(arr),1,mp);
		printf("res=%ld\n",res);
	}
    fclose(sp);
    fclose(mp);

	return 0;
}