C语言的系统,系统的结构出现异常会不会导致文件读取的异常?文件读取的异常怎么解决?要求是将两个文件的内容通过第三个文件进行交换的写法
不知道你这个问题是否已经解决, 如果还没有解决的话:#include<stdio.h>
//x + 1;//不带副作用
//x++;//带有副作用
#define MAX(a, b) ((a) > (b) ? (a) : (b))
int main()
{
int x = 5;
int y = 8;
int z = MAX(x++, y++);
printf("x=%d y=%d z=%d\n", x, y, z);//输出的结果是什么?
return 0;
}
会
不要把
fopen("...","...");fscanf,fprintf,fgets,fgetc,fputc,fclose //读时把\r\n替换成\n,写时把\n替换成\r\n;读到\x1a就设置EOF;读写的内容当字符看待
和
fopen("...","...b");fseek,ftell,fread,fwrite,fscanf,fprintf,fgets,fgetc,fputc,fclose //不作以上替换,遇到\x1a仍继续读;读写的内容当字节看待
弄混了
the return value is EOF for fscanf
fread returns the number of full items actually read, which may be less than count if an error occurs or if the end of the file is encountered before reaching count. Use the feof or ferror function to distinguish a read error from an end-of-file condition.
fgetc return the character read as an int or return EOF to indicate an error or end of file.
fgets function returns string. NULL is returned to indicate an error or an end-of-file condition. Use feof or ferror to determine whether an error occurred.
fputc return value of EOF indicates an error
On an error, fputs returns EOF
fprintf returns the number of bytes written, returns a negative value instead when an output error occurs.
fwrite returns the number of full items actually written, which may be less than count if an error occurs.