Question

error C2440: '=' : cannot convert from 'bool' to 'struct _iobuf *'

以下程序代码是从教材上完全录入的，但是运行后却显示：
--------------------Configuration: c - Win32 Debug--------------------
Compiling...
c.cpp
d:\program files\microsoft visual c++ 6.0\myprojects\fputc fgetc\c.cpp(8) : error C2440: '=' : cannot convert from 'bool' to 'struct _iobuf *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

c.obj - 1 error(s), 0 warning(s)

程序源代码如下：
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE *fp;
char ch,filename[10];
scanf("%s",filename);
if((fp=fopen("filename","w")==NULL))
{
printf("cannot open file\n");
exit(0);
}
ch=getchar();
ch=getchar();
while(ch!='#')
{
fputc(ch,fp);
putchar(ch);
}
putchar(10);
fclose(fp);
}
请高手指点,谢谢！

Answer 1

改成：
if( (fp=fopen("filename","w") )==NULL)

这个意思是说：
fp = fopen("filename","w");
if(fp == NULL)

Answer 2

很明显，if((fp=fopen("filename","w")==NULL))
改成if((fp=fopen("filename","w"))==NULL)