回答編集履歴
3
修正
test
CHANGED
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@@ -4,9 +4,9 @@
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4
4
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5
5
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```C++
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6
6
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7
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-
#include <
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7
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+
#include <iostream>
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8
8
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9
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-
#include <
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9
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+
#include <algorithm>
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10
10
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11
11
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#include <cstring>
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12
12
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@@ -22,15 +22,15 @@
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22
22
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23
23
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24
24
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25
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-
str =
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25
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+
str = new char[std::strlen(str2)+1];
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26
26
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27
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-
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27
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+
std::copy_n(str2, std::strlen(str2)+1, str);
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28
28
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29
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-
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29
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+
std::cout << str;
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30
30
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31
31
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32
32
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33
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-
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33
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+
delete[] str;
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34
34
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35
35
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}
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36
36
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2
微修正
test
CHANGED
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@@ -12,7 +12,7 @@
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12
12
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13
13
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14
14
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15
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-
char* str =
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15
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+
char* str = nullptr;
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16
16
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17
17
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18
18
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1
追記
test
CHANGED
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@@ -1 +1,37 @@
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1
1
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コピー先である str が NULL だから。
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2
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+
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3
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+
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4
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+
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5
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+
```C++
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6
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+
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7
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+
#include <cstdio>
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8
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9
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#include <cstdlib>
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10
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11
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+
#include <cstring>
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12
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13
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+
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14
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+
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15
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char* str = NULL;
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16
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+
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17
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+
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18
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+
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19
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+
int main() {
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20
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+
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21
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const char* str2 = "aaa";
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22
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23
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+
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24
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25
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str = (char*)malloc(strlen(str2)+1);
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26
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+
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27
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memcpy(str, str2, strlen(str2)+1);
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28
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+
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29
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printf("%s",str);
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30
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+
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31
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+
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32
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+
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33
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+
free(str);
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34
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+
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35
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+
}
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36
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+
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37
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+
```
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