文件编程

手动创建两个文本文件text1.txt,text2.txt,要求编程创建text3.txt,实现text1.txt和text2.txt文件中除去首行和末尾对应的数据相加,三个文本的内容如下
text1：
begin
10 11 12
20 21 22
30 31 31
end

text2:
begin
15 16 17
25 26 27
35 36 37
end

text3:
begin
25 27 29
45 47 49
65 67 68
end

#include <stdio.h> 
#include <string.h>
#define SIZE 1024

int main()
{
	FILE *fp1 = fopen (\"text1.txt\",\"ab+\");//以读和写方式打开
	FILE *fp2 = fopen (\"text2.txt\",\"ab+\");
	
	if(fp1 == NULL)
	{
		perror(\"fopen fp1 \");
		return -1;
	}
	if(fp2 == NULL)
	{
		perror(\"fopen fp2 \");
		return -1;
	}
	
	FILE *fp3 = fopen (\"text3.txt\",\"ab+\");
	if(fp3 == NULL)
	{
		perror(\"fopen fp3\");
		return -1;
	}
	
	char buf1[SIZE] = {0};
	char buf2[SIZE] = {0};
	char buf3[SIZE] = {0};
	
	int ret;
	while(1)
	{	
		ret = fread(buf1,sizeof(char),SIZE-1,fp1);
		if (0 == ret)  // 可能是文件结尾， 也可能是发生错误
		{
			if (feof(fp1) == 0) // 错误  
			{
				printf (\"文件发生错误\\n\");
				return -1;
			}
			
			break;
		}
		buf1[ret*sizeof(char)] = \'\\0\';
		printf(\"%s\\n\",buf1);
		printf(\"\\n\");
	}
	
	int ret2;
	while(1)
	{	
		ret2 = fread(buf2,sizeof(char),SIZE-1,fp2);
		if (0 == ret2)  // 可能是文件结尾， 也可能是发生错误
		{
			if (feof(fp2) == 0) // 错误  
			{
				printf (\"文件发生错误\\n\");
				return -1;
			}
			
			break;
		}
		buf2[ret2*sizeof(char)] = \'\\0\';
		printf(\"%s\\n\",buf2);
	}
	
	strcpy(buf3,buf1);
	int i = 0;
	while(buf2[i] != \'\\0\')
	{
		if(buf2[i] >= \'0\' && buf2[i] <= \'9\')
		{
			buf3[i] = buf1[i] + buf2[i] - \'0\';
		}
		i++;
	}
	int len = strlen(buf1); //要传输的数据个数，不是字节长度
	fwrite(buf3,sizeof(char),len,fp3);	
	
	printf(\"\\n\");
	printf(\"%s\\n\",buf3);
	printf(\"\\n\");
	
	fclose(fp1);
	fclose(fp2);
	fclose(fp3);
	return 0;
}