1、fgetc和fputc拷贝文件。

#include <myhead.h>


int main(int argc, const char *argv[])
{
	/*
	*/
	if(argc != 3)
	{
		printf("外部参数错误\n");
		return -1;
	}
	FILE *fp1 = fopen("./1.txt","r");
	if(NULL == fp1)
	{
		perror("fp1");
		return -1;
	}	
	FILE *fp2 = fopen("./2.txt","w");
	if(NULL == fp2)
	{
		perror("fp2");
		return -1;
	}
	char buff;
	while((buff = fgetc(fp1)) != EOF)
	{
		fputc(buff,fp2);
	}
	fclose(fp1);
	fclose(fp2);
	printf("拷贝成功\n");

	fp2 = fopen("./2.txt","r");
	if(NULL == fp2)
	{
		perror("fp2");
		return -1;
	}

	while(1)
	{
		char rev = fgetc(fp2);
		if(rev == EOF)
		{
			break;
		}
		fputc(rev,stdout);
	}
	fclose(fp2);
	return 0;
}

2、fgets获取文件的行号。

#include <myhead.h>


int main(int argc, const char *argv[])
{
	/*
		*/
	FILE *fp;
	fp = fopen("./1.txt","r");
	if(fp == NULL)
	{
		perror("fopen");
		return -1;
	}
	char buff[100];
	int m = 0,i = 0;
	while(fgets(buff,sizeof(buff),fp) != NULL)
	{
		for(i = 0;buff[i] != 0;i++)
		{
			if(buff[i] == 10)
			{
				m++;
			}
		}
	}
	printf("%d",m);
	putchar(10);

	fclose(fp);

	return 0;
}

3、fgets和fputs拷贝文件。

#include <myhead.h>


int main(int argc, const char *argv[])
{
	/*
	*/
	if(argc != 3)
	{
		printf("外部参数错误\n");
		return -1;
	}
	FILE *fp1 = fopen("./1.txt","r");
	if(NULL == fp1)
	{
		perror("fp1");
		return -1;
	}	
	FILE *fp2 = fopen("./2.txt","w");
	if(NULL == fp2)
	{
		perror("fp2");
		return -1;
	}
	char buff[100];
	while(fgets(buff,sizeof(buff),fp1) != NULL)
	{

		fputs(buff,fp2);
	}
	fclose(fp1);
	fclose(fp2);
	printf("拷贝成功\n");

	fp2 = fopen("./2.txt","r");
	if(NULL == fp2)
	{
		perror("fp2");
		return -1;
	}

	while(1)
	{
		char rev[100];
		if(fgets(rev,sizeof(rev),fp2) == NULL)
		{
			break;
		}
		printf("%s",rev);
	}
	fclose(fp2);
	return 0;
}