求数组下标问题

[pangder]

有数组int a[]={1,2,3,4,5,6,7,8}，查找4的位置，把a复制给b，将a的内容反转。再次查找4的位置。我不知道怎么查找出4的位置，谁能教教我~谢谢
#include<iostream>
#include<algorithm>
#include<functional>
using namespace std;
void main(){
int a[]={1,2,3,4,5,6,7,8},b[8];
copy(a,a+8,b);
reverse(a,a+8);
cout<<( *find(a,a+8,4)==4)<<endl;
copy(a,a+8,ostream_iterator<int>(cout," "));
cout<<endl;
copy(b,b+8,ostream_iterator<int>(cout," "));
cout<<endl;
}

[iu_81]

strchr

[HelloDan]

#include <iostream>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
int a[]={1,2,3,4,5,6,7,8},b[8];
copy(a,a+8,b);
reverse(a,a+8);
cout <<( find(a,a+8,4)-a) <<endl;
//copy(a,a+8,ostream_iterator <int>(cout," "));
for(int i=0;i<8;++i)
	cout<<a[i]<<" ";
cout <<endl;
//copy(b,b+8,ostream_iterator <int>(cout," "));
for(int i=0;i<8;++i)
	cout<<b[i]<<" ";
cout <<endl;
cout <<endl;

 return 0;
} 
//不好意思，那个ostream_iterator的好久没有用过，忘了。

[pangder]

2楼的朋友，运行你的程序在FOR那出错。
我想问下cout <<( find(a,a+8,4)-a) <<endl这个语句是什么意思

[goodallen1985]

#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;

void main()
{
int a[]={1,2,3,4,5,6,7,8},b[8];
copy(a,a+8,b);
reverse(a,a+8);

cout <<( *find(a,a+8,4))<<endl;
copy(a,a+8,ostream_iterator <int>(cout," "));
cout <<endl;
cout <<( *find(b,b+8,4))<<endl;
copy(b,b+8,ostream_iterator <int>(cout," "));
cout <<endl;
}

[goodallen1985]

#include <iostream> 
#include <algorithm> 
#include <functional> 
using namespace std; 

void main()
{ 
int a[]={1,2,3,4,5,6,7,8},b[8]; 
copy(a,a+8,b); 
reverse(a,a+8); 

cout <<( *find(a,a+8,4))<<endl; 
copy(a,a+8,ostream_iterator <int>(cout," ")); 
cout <<endl; 
cout <<( *find(b,b+8,4))<<endl; 
copy(b,b+8,ostream_iterator <int>(cout," ")); 
cout <<endl; 
} 

[goodallen1985]

晕死，粘贴错了，两次！

#include <iostream> 
#include <algorithm> 
#include <functional> 
using namespace std; 

void main()
{ 

int a[]={1,2,3,4,5,6,7,8},b[8]; 
copy(a,a+8,b); 
reverse(a,a+8); 

cout <<(find(a,a+8,4)-a)<<endl; 
copy(a,a+8,ostream_iterator <int>(cout," ")); 
cout <<endl; 
cout <<(find(b,b+8,4)-b)<<endl; 
copy(b,b+8,ostream_iterator <int>(cout," ")); 
cout <<endl; 

} 

[qmm161]

这种代码还是不要用stl来写吧！如果不知道怎么查找4，即便告诉你有这个库函数可以用，也没多大意义！

[pangder]

终于弄明白了~谢谢goodallen1985 和HelloDan
结贴！！！

[Treazy]

char *strchr(char *str,char ch)

在字符串str中搜索一个字符ch的位置

[visame]

在我的G++下运行正常
      1 #include <iterator>
      2 #include <iostream>
      3 #include <algorithm>
      4 #include <functional>
      5 using namespace std;
      6 int main()
      7 {
      8         int a[]={1,2,3,4,5,6,7,8},b[8];
      9         copy(a,a+8,b);
     10         reverse(a,a+8);
     11         cout <<( *find(a,a+8,4)==4) <<endl;
     12         copy(a,a+8,ostream_iterator <int>(cout," "));
     13         cout <<endl;
     14         copy(b,b+8,ostream_iterator <int>(cout," "));
     15         cout <<endl;
     16 }
OUTPUT:
1
8 7 6 5 4 3 2 1
1 2 3 4 5 6 7 8