c++的程式碼超簡單超奇怪的問題= =

2009-04-18 4:45 pm

#include "stdafx.h"

#define ARRAY_SIZE 2

void read_array(int x[][ARRAY_SIZE], int n);

void main()
{
int i,j,n=ARRAY_SIZE;
int a[ARRAY_SIZE][ARRAY_SIZE];

for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{a[i][j]=0;
}

printf("%d %d \n%d %d\n", a[1][1], a[1][2], a[2][1], a[5][5]);

}

以上我想製造出一個5*5的矩陣
而且把裡面全都清為0
但是出來之後很神奇的是矩陣裡面竟然有1 有3 有6...
只有大約一半的數字是0....
請問有人能告訴我這是怎麼回事ㄇ ˊˋ

更新1:

ㄜ上面有一ㄍ打錯了 #define ARRAY_SIZE 5 <---這是5 貼上來之前忘記修改~

回答 (3)

bean_bottom_2

2009-04-18 7:50 pm

✔ 最佳答案

Arrays in C or C++ starts at 0 and ends with n-1 where n is the size of the array. So array a starts at a[0][0] and ends at a[4][4]. Thus, your loops assign something at a[5][5] which is not your array. You should loop from 0 to 4 and print a[4][4] instead of a[5][5].

2009-04-18 11:50:51 補充：
Arrays in C or C++ starts at 0 and ends with n-1 where n is the size ofthe array. So array a starts at a[0][0] and ends at a[4][4]. Thus, yourloops assign something at a[5][5] which is not your array. You shouldloop from 0 to 4 and print a[4][4] instead of a[5][5].

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[匿名]

2009-04-18 10:54 pm

呵~除了樓上的回答之外,有個方法蠻快的,
int a[ARRAY_SIZE][ARRAY_SIZE]={0};
這樣就全部是0了

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[匿名]

2009-04-18 5:28 pm

水啦...可以把答案寫在回答那邊ㄇ@@
這樣在過3個小時時間到之後就可以選你為最佳解答摟XD

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c++的程式碼超簡單 超奇怪的問題= =

回答 (3)

c++的程式碼超簡單超奇怪的問題= =