1) 下面代码有哪些错误?(台湾某公司05年12月笔试题)
#include <iostream>
using namespace std;
int main()
{
int &t1;
int *pi;
*pi = 3;
const double dt;
cout<<pi<<endl;
return 0;
}
答案
2)下面是一个蛇型矩阵
21 22 23。。。
20 7 8 9 10
19 6 1 2 11
18 5 4 3 12
17 16 15 14 13
设1点的坐标为(0,0),X方向向右为正,y方向向下为正,如:7的坐标为(-1,-1),2的坐标为(0,1),编程实现输入任意一坐标(x,y),输出所对应的数.(诺基亚05年笔试题).
#include <iostream>
#include <cstdlib>
#include <algorithm>
using namespace std;
const int N = 100;
int data[N + 1][N + 1];
enum DIRECTION
{
RIGHT, DOWN , LEFT, UP
};
//模拟整个过程
void Simulate(int n)
{
int x, y;
x = y = (n - 1) / 2; //1的位置
data[x][y] = 1;
int len = 1;
int count = 0;
int num = 2;
DIRECTION dir = RIGHT;
while(num <= n * n)
{
for(int i = 0; i < len; i++)
{
switch(dir)
{
case LEFT:
--y; break;
case RIGHT:
++y; break;
case UP:
--x; break;
case DOWN:
++x; break;
default: break;
}
data[x][y] = num++;
}
count++;
if(count == 2)
{
count = 0;
len++;
}
dir = (DIRECTION)((dir + 1) % 4);
}
}
//打印螺旋矩阵
void Output(int n)
{
int i, j;
for(i = 0; i < n; i++)
{
cout << data[i][0];
for(j = 1; j < n; j++)
cout << "\t" << data[i][j];
cout << endl;
}
}
//以(1,1)所在位置作为原点,向右作为x正半轴,向下作为y正半轴
int GetValue(int x, int y)
{
int m = max(abs(x), abs(y));
int rightBottom = m * m * 4 - 2 * m + 1;
int value = 0;
if(x == -m)
{
value = rightBottom + 2 * m + m - y;
}
else if( y == m)
{
value = rightBottom + m - x;
}
else if(y == -m)
{
value = rightBottom + 4 * m + x + m;
}
else if( x == m )
{
value = rightBottom - (m - y);
}
return value;
}
void TestPos(int n)
{
int i, j;
for(i = 0; i < n; i++)
{
cout << GetValue(0 - (n - 1) / 2, i - (n - 1) / 2);
for(j = 1; j < n; j++)
cout << "\t" << GetValue(j - (n - 1) / 2, i - (n - 1) / 2);
cout << endl;
}
}
int main()
{
int n;
while(cin >> n)
{
if(n <= 0 || n > 100)
{
cerr << "Size error!" << endl;
break;
}
else
{
Simulate(n);
Output(n);
cout << "*******************" << endl;
TestPos(n);
}
}
return 0;
}
本文转自Phinecos(洞庭散人)博客园博客,原文链接:http://www.cnblogs.com/phinecos/archive/2006/12/01/579505.html,如需转载请自行联系原作者