C语言 预期标识符或 '(' 在 'for' 之前
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expected identifier or ‘(’ before ‘for’
提问by Calvin Hu
/** @file alloc.c */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#define NEW_BLOCK_SIZE 1024
#define ARRAY_SIZE 31
typedef struct _metadata_mem
{
size_t size;
void * addr ;
struct _metadata_mem * next_free ;
struct _metadata_mem * pre_free;
char * unit ;
} metadata_mem;
#define SIZE_OF_MATEDATA sizeof(metadata_mem)
metadata_mem * array_of_block[31] ;
int i;
for(i=0; i<31; i++){
array_of_block[i]=NULL;
}
int index(size_t size){
int count=0;
while((int)size>=2){
size/=2;
count++;
}
return count ;
}
I received the following error and it starts in the for loop:
我收到以下错误，它从 for 循环开始：
gcc alloc.c -O3 -Wextra -Wall -Werror -Wno-unused-result -Wno-unused-parameter -o alloc.so -shared -fPIC
alloc.c:30:2: error: expected identifier or ‘(' before ‘for'
alloc.c:30:12: error: expected ‘=', ‘,', ‘;', ‘asm' or ‘__attribute__' before ‘<' token
alloc.c:30:26: error: expected ‘=', ‘,', ‘;', ‘asm' or ‘__attribute__' before ‘++' token
alloc.c:35:5: error: conflicting types for ‘index'
make: *** [alloc.so] Error 1
I have no idea what's wrong with the for loop. It seems OK. Am I not supposed to initialized the array_of_block in the global context ?
我不知道 for 循环有什么问题。看起来还可以。我不应该在全局上下文中初始化 array_of_block 吗？
Thanks a lot.
非常感谢。
回答by David Sainty
The code needs to be inside a function. If this code is the only code in the program, the function is called "main". In its (almost) simplest form:
代码需要在函数内部。如果此代码是程序中的唯一代码，则该函数称为“main”。以其（几乎）最简单的形式：
int main() {
... your code
}
回答by Calvin Hu
It's been a while, but that "for" statement needs to be wrapped in a function, doesn't it? Don't think you can do procedural statements at the file block level.
已经有一段时间了，但是“for”语句需要包含在一个函数中，不是吗？不要认为您可以在文件块级别执行过程语句。
