IO思维导图、练习1

1、使用fgets统计一个文件的行号

#include
#include
#include
int main(int argc, const char *argv[])
{
	FILE *fp;
	if((fp = fopen("./test1.c","r")) == NULL)
	{
		perror("open file");
		return -1;
	}
	char buf[1024];
	int count=0;
	while(fgets(buf,sizeof(buf),fp) != NULL)
	{
		if(buf[strlen(buf)-1] == '\n')
		{
			count++;
		}
	}
	printf("行号为:%d\n",count);

	return 0;
}

 2、使用fgets、fputs拷贝文件

#include
#include
#include
int main(int argc, const char *argv[])
{
	FILE *srcfp,*destfp;
	if((srcfp = fopen("./file2.txt","r")) == NULL)
	{
		perror("open file");
		return -1;
	}
	if((destfp = fopen("./file1.txt","w")) == NULL)
	{
		perror("open file");
		return -1;
	}
	char buf[1024];
	while(fgets(buf,sizeof(buf),srcfp) != NULL)
	{
		fputs(buf,destfp);
	}
	fclose(srcfp);
	fclose(destfp);
	return 0;
}

 

 

 3、思维导图