C++
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x
51
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using namespace std;8
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class samp {10
char *s;11
public:12
samp() { cout << "a"; s = '\0'; }13
~samp() { if (s) free(s); cout << "sを開放する\n"; }14
void show() { cout << s << "\n"; }15
void set(char* str);16
};17
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void samp::set(char* str) {19
cout << __LINE__ << ":" << str << endl;20
s = (char*)malloc(strlen(str) + 1);21
if (!s) {22
cout << "メモリ割り当てエラー\n";23
exit(1);24
}25
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strcpy(s, str);27
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}29
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void input( samp& ob ) {31
char s[80];32
cout << "文字列の入力： ";33
cin >> s;34
cout << __LINE__ << ":" << s << endl;35
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ob.set(s); 37
}38
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int main()40
{41
samp ob;42
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input( ob );44
ob.show();45
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return 0;47
}48
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// end.51
$ g++ prog.cc -Wall -Wextra
Stdin
abc
Start
prog.cc: In constructor 'samp::samp()':
prog.cc:12:31: error: invalid conversion from 'char' to 'char*' [-fpermissive]
12 | samp() { cout << "a"; s = '\0'; }
| ^~~~
| |
| char
1
Finish