一条语句放在for循环的内外，放在里面报错

[陈思有]

#include <iostream>
#include <vector>
using namespace std;

int main()
{
	vector<int> ivec;
	int a;

	while (cin >> a)
	{
		ivec.push_back(a);
	}

	int *p = new int[ivec.size()];
         int *q = p;//这条语句如果放在for循环里面会出错，放在外面就没事？？？
	for(vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); iter++, q++)
	{
		*q = *iter;
	}

	for (size_t i = 0; i != ivec.size(); i++)
	{
		cout << *(p + i) << endl;
	}

	delete [] p;

	return 0;
}

F:\C++primer练习\第四章\28.cpp(34) : warning C4518: 'int ' : storage-class or type specifier(s) unexpected here; ignored
F:\C++primer练习\第四章\28.cpp(34) : error C2440: 'initializing' : cannot convert from 'int *' to 'int ** '
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
F:\C++primer练习\第四章\28.cpp(34) : warning C4228: nonstandard extension used : qualifiers after comma in declarator list are ignored
F:\C++primer练习\第四章\28.cpp(34) : error C2146: syntax error : missing ')' before identifier 'iter'
F:\C++primer练习\第四章\28.cpp(34) : warning C4552: '!=' : operator has no effect; expected operator with side-effect
F:\C++primer练习\第四章\28.cpp(34) : error C2059: syntax error : ';'
F:\C++primer练习\第四章\28.cpp(34) : error C2059: syntax error : ')'
F:\C++primer练习\第四章\28.cpp(35) : error C2143: syntax error : missing ';' before '{'
F:\C++primer练习\第四章\28.cpp(36) : error C2440: '=' : cannot convert from 'int' to 'int *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
执行 cl.exe 时出错.

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

[qixing1115]

for(vector<int>::iterator iter = ivec.begin(); iter != ivec.end(); iter++, q++)
看标红的，你还没声明就用了

[ppsharp]

int *q = p;
vector<int>::iterator iter = ivec.begin()

这是两个不同类型的初始化，
for循环里面只能放同一类型的初始化。

比如说int i = 0, *a = & i;

这里只有一个分号，你怎么可以放两个不同类型的初始化呢，也放不进去

[从头来过]

放到for里面的话 ，你for中q++，q还没定义就使用了

[ppsharp]

C++ Primer 英文影印版 第210页

[陈思有]

我傻了，汗