警告已弃用从字符串常量转换为char*

Question

我使用cmd来编译.bat和g ++.exe.谁能告诉我我做错了什么？我正在使用它来练习,因为我遵循关于字符串和数组的教程.请记住,我还在学习.

main.cpp: In function 'int main()':
main.cpp:6:12: warning: deprecated conversion from string constant to 'char*' [-
Wwrite-strings]
main.cpp:10:12: warning: deprecated conversion from string constant to 'char*' [
-Wwrite-strings]
main.cpp:11:12: warning: deprecated conversion from string constant to 'char*' [
-Wwrite-strings]
Press any key to continue . . .

我的代码:

      using namespace std;
#include <iostream>

int main() {
//Asterisk to make the variable an array. Takes 8 bytes of memory (8 characters including spaces).
 char *a = "hi there";
//Inside square brackets is the number of bytes of memory to use. More consumtion of resources
 char b[500]="hi there";
 //For a new line, type \n. For a tab, type \t.
 char *c = "Hi There\nFriends!";
 char *d = "\t\tHi There Friends!";
 //endl will end the line.
 cout << a;
 cout << b << endl;
 cout << c << endl;
 cout << d << endl;
}

Answer 1

双引号之间的字符串是字符串文字.它们的数组char不被修改(尝试修改它们会调用未定义的行为).这就是为什么你应该声明指向字符串文字的指针const char *- 这样,如果某些代码错误地尝试在文字中写入/修改字符,编译器将有机会捕获此错误.