Exercise7-6 文件操作

/**
 * Description:Exercise 7-6 - write a program to compare two files, printing the first line where they differ
 * Author: Gecko
 * Date: 2012-11-30 16:11
 * Note: The two files have the same number of Lines
 **/

#include <stdio.h>
#include <string.h>

#define MAXSIZE 1000

int cmplines(char *lineone,char *linetwo,int linenum)
{
	if(strcmp(lineone,linetwo)!=0)
	{
		printf("The different line is %d:\n",linenum);
		printf("the fileone is: %s.",lineone);
		printf("the filetwo is: %s.",linetwo);
		return -1;
	}
	return 0;
}

int main(int argc,char *argv[])
{
	FILE *fileone,*filetwo;
	char *lineone,*linetwo;
	int linenum=0;
	if(argc != 3)
	{
		printf("differ fileone and filetwo.\n");
		return 0;
	}
	if((fileone = fopen(argv[1],"r")) == NULL)
	{
		printf("Erro opening the file %s.\n",argv[1]);
		return 0;
	}
	if((filetwo= fopen(argv[2],"r")) == NULL)
	{
		printf("Erro opening the file %s.\n",argv[2]);
		return 0;
	}
	while(fgets(lineone,MAXSIZE,fileone) != NULL && fgets(linetwo,MAXSIZE,filetwo) != NULL)
	{
		if(cmplines(lineone,linetwo,linenum) == 0)
			linenum++;
		else
		  return 0;
	}
	printf("The two files are identical to each other.\n");
	return 0;

}